Consent, Capacity & MCA 2005 for UKMLA

The GMC puts UK medical law at the centre of the UKMLA for a reason: modern practice is no longer technically driven. It is patient-centred, rights-based, and statutory. Candidates who cannot explain Montgomery, Gillick, the five MCA principles, and the line between DoLS and the Mental Health Act will lose disproportionate marks — and will be exposed in CPSA capacity and consent stations.

This pillar covers the UK medical-legal framework for UKMLA and foundation-year practice: consent types (expressed, implied, written) with Montgomery information standards, Gillick competence and Fraser guidelines, the Mental Capacity Act 2005 (five principles, two-stage capacity test, best-interests checklist), Advance Decisions to Refuse Treatment (ADRT), Lasting Power of Attorney (LPA), Deprivation of Liberty Safeguards (DoLS), Independent Mental Capacity Advocates (IMCA), the MCA–MHA interface, confidentiality and its exceptions, adult safeguarding, and the GMC's Good Medical Practice 2024 high-yield sections.

Use this alongside our psychiatry high-yield guide for the Mental Health Act, our geriatrics and frailty guide for MCA in practice in older adults, our CPSA station strategy guide for the communication scaffolding, and the breaking bad news guide for the conversation model that underpins consent discussions.

1. Why UK Medical Law Is UKMLA-Examined

The GMC's professional values are not optional knowledge — they underpin fitness to practise. Every UK graduate is expected to distinguish the MCA from the MHA, know that a Gillick-competent 14-year-old can consent to contraception without parental knowledge, recognise that a confused post-op patient may be being deprived of liberty without authorisation, and understand that confidentiality is not absolute.

The AKT tests the legal frameworks in clean vignettes; the CPSA tests your ability to have the actual conversation — explaining consent in plain English, assessing capacity while showing empathy, escalating to a best-interests decision when needed. Both reward candidates who can quote the MCA principles and the Montgomery standard by name, but also who can then operationalise them in a five-minute station.

Three habits build exam confidence in this domain: (1) know the exact wording of the five MCA principles — examiners reward precise language; (2) reason decision by decision — capacity is decision-specific and time-specific; (3) keep the MCA-versus-MHA distinction bright — the MCA protects from incapacity; the MHA authorises treatment of a mental disorder.

2. Types of Consent — Expressed, Implied, Written

Expressed consent is an explicit verbal or written agreement. The patient states they agree to the proposed intervention.

Implied consent is inferred from behaviour — rolling up a sleeve for a blood pressure measurement, opening the mouth for oral examination. Valid for low-risk, routine examinations and investigations but insufficient for significant interventions.

Written consent is required by GMC guidance for:

• Surgery, procedures under general or regional anaesthesia.
• Procedures with significant risk of adverse outcomes.
• Research or treatment where participation forms are required.
• Storage or use of human tissue under the Human Tissue Act 2004.
• Living organ donation.

Written consent is strong evidence of process but not itself a substitute for capacity, disclosure, and voluntariness. A signed form obtained from a patient lacking capacity or given insufficient information is not valid.

Valid consent has three elements:

1. Capacity — the patient must have capacity to consent to the specific intervention (see MCA, below).
2. Information — the patient must be given sufficient information (Montgomery — below).
3. Voluntariness — the patient must not be under undue influence, coercion, or duress.

3. Information Required for Valid Consent — Montgomery

Montgomery v Lanarkshire Health Board (2015) changed the UK legal standard for consent. Before Montgomery, the standard was Bolam (what a responsible body of doctors would disclose). Since Montgomery, the standard is patient-centred: a doctor is under a duty to take reasonable care to ensure that the patient is aware of any material risks and of reasonable alternative or variant treatments.

A risk is "material" if:

• A reasonable person in the patient's position would likely attach significance to it, or
• The doctor is, or should reasonably be, aware that this particular patient would likely attach significance to it.

In practice, this means:

• Tailor the information to the individual patient (their values, concerns, beliefs).
• Explain the nature and purpose of the intervention.
• Explain serious risks, common risks, and any risks that would matter to this patient even if rare.
• Explain reasonable alternatives, including no treatment, with their risks and benefits.
• Give the patient time to weigh the information — avoid consent on the morning of surgery wherever possible.
• Document the discussion.

UKMLA trap: a patient develops a complication not explicitly discussed pre-operatively. If the risk was material (meaningful to this specific patient) and not disclosed, consent may not be valid and the patient may have grounds for a claim. Pre-printed consent forms that tick every risk but with no recorded discussion fail the Montgomery test.

4. Gillick Competence and Fraser Guidelines

Gillick competence is the principle (from Gillick v West Norfolk and Wisbech Area Health Authority, 1985) that a child under 16 can consent to their own medical treatment if they have sufficient intelligence, competence, and understanding to fully appreciate what is involved. The decision is decision-specific and depends on the maturity of the child and the complexity of the decision.

Fraser guidelines are the specific criteria that must be met for a clinician to provide contraceptive advice or treatment to a young person under 16 without parental consent:

1. The young person understands the advice and its implications.
2. They cannot be persuaded to inform their parents.
3. They are likely to begin, or continue having, sexual intercourse with or without treatment.
4. Their physical or mental health is likely to suffer without the treatment.
5. Treatment is in their best interests.

UK age-specific consent rules:

• Under 16: can consent to treatment if Gillick competent. Cannot refuse treatment that is in their best interests if parents or the court consent (unlike capacitous adults). For contraception/STI — Fraser guidelines.
• 16–17: presumed to have capacity under the Family Law Reform Act 1969. Can consent; refusal of life-saving treatment can be overridden by the court.
• 18+: full adult rights under MCA; refusal is binding if capacitous.

Parental responsibility:

• Both biological parents if married at birth; mother automatically; father via registration, joint application, or court order.
• Adoptive parents.
• Those with a residence/child arrangements order.

UKMLA trap: 14-year-old requesting contraception, insists parents not be informed, understands the implications → provide contraception if Fraser criteria met. Don't insist on parental involvement.

5. Mental Capacity Act 2005 — The Five Principles

The MCA applies to adults (16+) in England and Wales (separate legislation in Scotland/NI — AWI and MCA NI). Every candidate must be able to name and apply the five principles.

Principle 1 — Presumption of capacity. Every adult has the right to make their own decisions and must be assumed to have capacity unless proved otherwise.

Principle 2 — All practicable steps to support decision-making. A person is not to be treated as unable to make a decision unless all practicable steps to help them have been taken without success (easy-read material, interpreters, visual aids, at a time of day when they are most alert, after food/sleep/pain relief, with family or advocate support).

Principle 3 — Unwise decisions. A person is not to be treated as unable to make a decision merely because they make an unwise decision. A capacitous adult can refuse a life-saving treatment even if clinicians disagree.

Principle 4 — Best interests. Any act done, or decision made, for a person who lacks capacity must be in their best interests.

Principle 5 — Least restrictive option. Before any act or decision, consideration must be given to whether the purpose can be achieved as effectively in a way that is less restrictive of the person's rights and freedoms.

UKMLA trap: a Jehovah's Witness with capacity refusing blood products for elective surgery — respect the refusal. Principle 3 protects unwise-seeming decisions. The only question is whether capacity is present at the time of the decision.

6. Two-Stage Capacity Test — How to Apply

A person lacks capacity if:

Stage 1 — Diagnostic: they have an impairment of, or disturbance in the functioning of, the mind or brain (this can be permanent — e.g. advanced dementia, learning disability — or temporary — e.g. delirium, severe depression, intoxication, head injury).

Stage 2 — Functional: they are unable to do one or more of the following:

• Understand the information relevant to the decision.
• Retain that information (long enough to make the decision).
• Use or weigh the information as part of the decision.
• Communicate the decision (by any means — speech, sign language, blinking, writing).

Both stages must be satisfied. Capacity is decision-specific (a patient may have capacity to consent to a blood test but not to complex surgery) and time-specific (a delirious patient may regain capacity once the cause is treated).

In practice:

• Explain the decision in plain language.
• Ask the patient to repeat it back (understanding).
• Confirm their recall after short delay (retention).
• Ask them to weigh pros and cons (weighing) — beliefs can be unusual but the process must engage with them.
• Confirm a decision (communication).

Documentation: record a structured capacity assessment — the impairment/disturbance, each limb of the functional test with what the patient said or did, and the conclusion.

Paradoxical decisions: delusion-driven refusal of treatment (e.g. a schizophrenic patient refusing antibiotics because they believe they are poisoned) typically fails the "use or weigh" limb — not because the decision is unwise, but because the patient cannot engage with the information on its real terms.

UKMLA trap: a young man with severe delusions refusing life-saving antibiotics because of a psychotic belief → likely lacks capacity (fails "use or weigh"). If treatment is for a physical disorder, the MCA authorises; if treatment is for the mental disorder itself, the MHA may be appropriate.

7. Best Interests Checklist

When a patient lacks capacity, the decision is made on a best-interests basis (MCA s.4). Best interests is not the same as "what the clinician thinks best" — it is a structured, patient-centred evaluation.

The MCA s.4 checklist:

• Do not make assumptions based solely on age, appearance, condition, or behaviour.
• Consider whether the person is likely to regain capacity and, if so, whether the decision can wait.
• Encourage the patient to participate as fully as possible.
• Consider the person's past and present wishes, feelings, beliefs, and values (advance statements, cultural/religious beliefs, lifestyle choices).
• Consult (where practicable and appropriate) those named by the person, carers, family, anyone with LPA or court-appointed deputy, and consider IMCA involvement.
• For life-sustaining treatment: must not be motivated by a desire to bring about the patient's death.

Best-interests meetings: for significant decisions (major surgery, withholding/withdrawing life-sustaining treatment, DNACPR where patient cannot participate, care home placement, sterilisation, certain experimental treatments), convene a structured meeting with documented outcome.

UKMLA trap: a patient lacking capacity with no family, facing a serious medical decision → IMCA referral is mandatory for serious medical treatment or accommodation decisions. Not just "good practice" — a statutory duty.

8. Advance Decisions and ADRTs

Advance Decision to Refuse Treatment (ADRT) is a legally binding statement made while capacitous that specifies treatments to be refused in specified future circumstances.

Validity conditions:

• Made when the patient had capacity.
• Specific to the treatment being refused and the circumstances.
• The patient has not done anything inconsistent with the decision since making it.
• For life-sustaining treatment: must be in writing, signed, witnessed, and state that it applies "even if life is at risk" or equivalent words.

ADRT binding scope:

• Refusal of specific treatments only.
• Cannot demand treatments (only refuse).
• Cannot refuse basic care (food and water by mouth, warmth, hygiene — but can refuse artificial nutrition and hydration).
• Cannot refuse treatment authorised by the MHA (e.g. treatment for a mental disorder if detained under section).

Advance statement: an expression of preferences (religious, cultural, personal care, preferred place of death). Not legally binding but must be considered in best-interests decisions.

UKMLA trap: an unconscious patient with a valid, applicable ADRT refusing blood products → respect the refusal, even if life is at risk.

9. Lasting Power of Attorney — Types and Limits

LPA (Lasting Power of Attorney) is a legal document allowing a person to appoint an attorney to make decisions on their behalf if they lose capacity. Must be registered with the Office of the Public Guardian.

Two types:

1. Property and financial affairs LPA — can be used with the donor's consent even while they have capacity, or after loss of capacity.
2. Health and welfare LPA — can only be used after the donor has lost capacity for the specific decision.

Health and welfare LPA powers:

• Consent to or refuse medical treatment (but cannot refuse life-sustaining treatment unless the LPA specifically authorises them to do so).
• Decide on medical care, moving into a care home, daily routine.

LPA limits:

• Cannot override a valid ADRT made after the LPA was granted (the later ADRT takes precedence).
• Cannot demand treatment that is not clinically indicated.
• Must act in the donor's best interests.

Court-appointed deputies: if the person loses capacity without making an LPA, the Court of Protection can appoint a deputy to make decisions. Deputies are subject to similar limits.

Historical enduring powers of attorney (EPA) are property/finance-only and remain valid if made before 1 October 2007.

UKMLA trap: daughter is LPA for health and welfare, wants to override a later-made valid ADRT refusing CPR → ADRT takes precedence.

10. Deprivation of Liberty Safeguards (DoLS) Overview

DoLS authorises deprivation of liberty in care homes and hospitals for people who lack capacity to consent to the arrangements and are deprived of liberty as a consequence.

The Cheshire West acid test (2014 Supreme Court): A person is deprived of liberty if they are:

1. Under continuous supervision and control, AND
2. Not free to leave.

The test applies regardless of whether the arrangements are ostensibly in the person's best interests, how pleasant the environment is, or the patient's apparent contentment.

DoLS process:

• Managing authority (hospital or care home) identifies possible deprivation of liberty.
• Applies to supervisory body (local authority).
• Six assessments carried out (age, mental health, mental capacity, best interests, eligibility, no refusals).
• Standard authorisation up to 12 months.
• Urgent authorisation for up to 7 days while standard is arranged.
• Representative appointed (IMCA if no family).
• Right of review via Court of Protection.

DoLS limits:

• Only applies in registered care homes and hospitals. For other community settings (supported living, own home, domestic settings), use the Court of Protection for deprivation of liberty authorisation.
• Applies to adults 18+ (for 16–17-year-olds, use the inherent jurisdiction of the court).
• Does not authorise treatment — separate consent/best-interests assessment required.

Liberty Protection Safeguards (LPS) were legislated (Mental Capacity Amendment Act 2019) to replace DoLS but have not yet been implemented as of 2026 — DoLS remains in force. Know that replacement is planned but current practice is DoLS.

UKMLA trap: a patient with dementia in a general ward who is kept in bed, receiving 1:1 care, and not allowed to leave (supervision + control + not free to leave) → meets the acid test → requires DoLS authorisation. Not just "best interests" alone.

11. IMCA — When and Why

Independent Mental Capacity Advocate (IMCA) is a statutorily appointed advocate to represent a person who lacks capacity where there is no suitable family or friend to consult.

Mandatory IMCA referrals:

• Serious medical treatment (withholding/withdrawing life-sustaining treatment, major surgery, invasive diagnostic procedures with serious consequences).
• Long-term change of accommodation (hospital stay >28 days; care home move >8 weeks).
• DoLS — IMCA support for the person's representative if no suitable person.

Discretionary IMCA referrals:

• Care reviews.
• Adult safeguarding proceedings (whether or not there is a family/friend).

IMCA is a statutory duty, not a courtesy. Failing to involve IMCA when required is a legal breach.

UKMLA trap: a patient lacking capacity with no family requires cardiac surgery → IMCA referral is mandatory before the operation can proceed (except in genuine emergency, where life-saving treatment can proceed under best-interests with IMCA arranged as soon as possible).

12. MCA vs MHA — When Each Applies

This distinction is a perennial UKMLA high-yield.

The practical rule:

• Physical disorder + lacks capacity → MCA (best interests).
• Mental disorder + needs hospital + meets criteria → MHA (detention).
• Physical disorder in a patient detained under MHA? → MHA does not authorise treatment of the physical disorder — use MCA for that.
• Mental disorder in a capacitous patient? → MHA if detention criteria met (or voluntary admission/outpatient care if patient consents).

UKMLA trap: a depressed patient on the medical ward, lacking capacity for their physical illness, treated under the MCA — if they also need to be formally detained for treatment of the depression itself, consider an MHA assessment alongside.

13. Confidentiality — GMC and UK Law Disclosure Exceptions

The default position is that patient information is confidential. Disclosure without consent can be justified in specified circumstances.

When disclosure is permissible (GMC guidance + UK law):

• Patient consents (express or implied — e.g. referrals, direct care within the team).
• Required by law: statutory notifications (notifiable infectious diseases under Health Protection (Notification) Regulations 2010, deaths registration, known/suspected FGM in under-18s, new HIV diagnoses to UKHSA), court orders, police requests under specific statutes (Road Traffic Act — identify driver), coroner.
• Public interest: where disclosure is necessary to prevent serious harm to others (risk of violence, harm to children, homicide, terrorism, driving while unfit — see below).
• To protect the patient from serious harm when they lack capacity.

Public interest threshold: the benefit to the public or individual outweighs the breach of confidentiality. Seek consent first if safe; consult senior colleagues; document reasoning.

Specific UK examples:

• DVLA: doctors must encourage patients with medical conditions affecting driving to inform DVLA; if the patient refuses and continues to drive, the doctor may need to disclose to DVLA medical adviser (follow GMC guidance — inform the patient you are doing so).
• Domestic abuse: adult victims with capacity choose whether to report; if there are children affected, safeguarding duty may override.
• Serious crime: disclosure may be justified if necessary to prevent serious harm.
• Sexually transmitted infections with partner at risk: encourage patient to disclose; consider disclosure without consent only in specific, documented circumstances.

Deceased patients: confidentiality continues. Consider duty to the deceased's wishes and the family's interests.

Access to records:

• Living patients have the right of access under GDPR / Data Protection Act 2018.
• Deceased: Access to Health Records Act 1990 allows the executor or someone with a claim arising from the death.

UKMLA trap: a patient with uncontrolled epilepsy continues driving despite advice. After reminding them of the duty to inform DVLA and offering support: if they still drive, inform DVLA medical adviser and tell the patient. This is not optional.

14. Safeguarding Adults — Thresholds and Duties

Safeguarding adults protects adults with care and support needs from abuse or neglect. The Care Act 2014 sets out the statutory framework in England.

Types of abuse (Care Act 2014):

• Physical, sexual, psychological, financial/material.
• Neglect and acts of omission.
• Discriminatory.
• Organisational.
• Domestic violence.
• Modern slavery.
• Self-neglect.

Duties of a registered health professional:

• Identify concerns — recognise signs of abuse or neglect.
• Raise a safeguarding alert with the local authority safeguarding adults team per local policy.
• Document clearly and factually.
• Support the person's wishes where they have capacity, respecting autonomy while acknowledging duty of care.
• Make capacity-informed decisions — a capacitous adult can choose to remain in a risky situation; support and provide information.

Professional Curiosity: asking questions, noticing inconsistency in explanations for injuries, being alert to coercion in relationships, checking who the patient is with.

Multi-agency approach: escalate to local authority safeguarding team, social care, police if crime suspected.

MAPPA / MARAC: multi-agency panels for high-risk perpetrators (MAPPA) or high-risk DV victims (MARAC).

UKMLA trap: an elderly patient's bruises do not match the history; suspected abuse by a family carer. Raise safeguarding concern per local policy, involving the patient where capacity allows.

15. GMC Good Medical Practice — High-Yield Sections

Good Medical Practice (GMC, 2024) sets the standards expected of all UK-registered doctors. The updated 2024 version groups duties under four domains:

Domain 1 — Knowledge, skills and development:

• Practise within your competence.
• Keep knowledge and skills up to date.
• Recognise limitations; refer when appropriate.
• Engage in CPD, appraisal, revalidation.

Domain 2 — Patients, partnership and communication:

• Treat patients as individuals; respect dignity and autonomy.
• Communicate clearly, honestly, sensitively.
• Obtain valid consent.
• Respect confidentiality (with exceptions).
• Support patients to make informed decisions.

Domain 3 — Colleagues, culture and safety:

• Work with colleagues respectfully; avoid bullying/discrimination.
• Be open about errors (duty of candour) — admit mistakes, apologise, explain, learn.
• Raise concerns about colleagues' performance, conduct, or health when patient safety is at risk (whistleblowing duty).
• Promote a positive working culture.

Domain 4 — Trust and professionalism:

• Act with honesty and integrity.
• Avoid conflicts of interest; declare them.
• Do not express personal beliefs in a way that causes distress or discrimination.
• Social media — maintain professional standards.
• Respond to regulators, coroners, inquests honestly.

Duty of candour (2015 onwards, statutory and professional):

• Applies to notifiable safety incidents (moderate or severe harm, death).
• Tell the patient as soon as reasonably practicable.
• Apologise; explain what happened and what will be done.
• Document.
• Follow organisational duty of candour process.

Whistleblowing / raising concerns:

• Local escalation first (supervisor, clinical lead, medical director).
• Escalate to regulator (GMC, CQC) if local resolution inadequate.
• Public Interest Disclosure Act 1998 provides legal protection.

Probity:

• Do not commit fraud or dishonesty.
• Accurate documentation.
• Do not misrepresent qualifications, experience, or credentials.
• Declare financial interests.

UKMLA trap: you witness a colleague prescribing outside guidelines and refusing to update practice → raise concerns locally first (supervisor); if unresolved and patient safety at risk, escalate to medical director / GMC / CQC. You cannot simply ignore it.

The UKMLA Consent & Capacity Pattern Library

Twelve stems worth owning:

1. 14-year-old requesting contraception, understands implications, refuses parental disclosure → Fraser criteria met → provide contraception.
2. Capacitous Jehovah's Witness refusing blood pre-elective surgery → respect refusal; unwise ≠ incapacitous.
3. Elderly patient with delirium who becomes aggressive, kept in bed with 1:1 supervision → DoLS authorisation required.
4. Patient with no family, lacking capacity, needs cardiac surgery → IMCA referral mandatory.
5. Patient's daughter holds H&W LPA; patient has valid ADRT refusing CPR → ADRT takes precedence.
6. Schizophrenic patient refuses antibiotics for pneumonia due to delusion → fails "use or weigh" → MCA best-interests for physical treatment; consider MHA if mental disorder needs admission.
7. Patient with poorly controlled epilepsy continues driving despite advice → inform patient, document attempts, disclose to DVLA if risk persists.
8. Pre-operative consent taken on day of surgery, no risk discussion documented → consent not valid under Montgomery.
9. Suspected elder abuse with inconsistent injury history → raise safeguarding alert per policy; involve adult with capacity in decision.
10. Colleague dispensing medication outside competence → raise concerns via local channels first; escalate if unresolved.
11. Serious adverse event — minor harm but patient harmed → duty of candour: open, apologetic, factual explanation, documented.
12. Patient with dementia in care home who is not free to leave and under continuous supervision → meets Cheshire West acid test → DoLS.

Putting It All Together

The UKMLA examines UK medical law because foundation-year doctors use these frameworks every day. Remembering the five MCA principles verbatim, the two-stage capacity test, the Montgomery information standard, the Cheshire West acid test, the Fraser criteria, and the duty of candour will answer the majority of vignette questions. Add the GMC's Good Medical Practice domains for professionalism questions, and you have a stable scaffold.

Pair this pillar with our psychiatry high-yield guide for the Mental Health Act sections and their relation to the MCA, the geriatrics and frailty guide for MCA and DoLS in daily geriatric practice, the CPSA station strategy guide for the communication scaffolding in capacity and consent stations, and the breaking bad news guide for the conversation frame that underpins informed consent discussions. The what to do if you fail guide covers the appeals framework that itself is a form of consent — knowing your own rights.

If a capacity or consent SBA is unclear, the reliable trick is to answer the three questions: (1) Does this decision require capacity, and is there an impairment? (2) Can the patient understand, retain, weigh, and communicate? (3) If they can't, what would they have wanted — and who must we consult? Three questions get you to the right answer almost every time. Ready to test yourself? Start with an MLA Prep consent and capacity mini-mock and see which of the twelve patterns you close on first read.