GUIDES
A retrospective opinion examines capacity for an identified act at a past date. Its reliability depends on the correct legal test, the surviving evidence and clearly stated limitations.
Author: Nellie Supports Ltd
Publication Date: 15/05/2026
Mental Capacity Act 2005, c. 9. Available at: https://www.legislation.gov.uk/ukpga/2005/9/contents
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A retrospective opinion examines capacity for an identified act at a past date. Its reliability depends on the correct legal test, the surviving evidence and clearly stated limitations. The sections below explain the evidence, practical steps and limits of the assessment or process.
A retrospective opinion asks whether a person had capacity for an identified act at a past date, sometimes after death. It uses medical and care records, professional files, documents and witness accounts from the relevant period. The legal test depends on the act and legal question: Banks v Goodfellow governs a person’s own will, while other statutory or common-law rules may apply to gifts, contracts, settlements or LPAs. Agree that framework with the instructing lawyer before reconstructing the evidence.
Disputed transactions are where retrospective capacity work earns its keep: a house transferred to one child and challenged by another, a late-life gift to a new companion, a contract or settlement signed as a condition advanced, a will contested after death. In each, the legal validity of what was done turns substantially on the person's capacity at the time they did it, and the retrospective assessment supplies the evidence upon which that question is fought and decided.
List each disputed act, its material dates and the legal issue. Banks v Goodfellow governs ordinary will-making; Re Beaney concerns understanding for lifetime gifts relative to their significance. Do not assume that every transaction uses one identical Mental Capacity Act test. The lawyer should identify the applicable framework and any issue about timing, validity or burden of proof, with the expert’s analysis kept separate for each act.
For a disputed gift or transfer at undervalue, establish what was given, its approximate value, its significance within the person’s overall assets and what remained for their needs. Re Beaney addresses the understanding required for gifts in that context. Avoid treating its approach as a universal escalating legal threshold for every property sale, will or contract.
Transaction disputes rarely arrive as capacity claims alone. Undue influence, unconscionable bargain and want of knowledge and approval travel alongside, and each is a distinct legal question with its own elements. The capacity expert's discipline is to answer the capacity question on the capacity evidence, whilst recording the circumstantial matter, dependence, isolation, the beneficiary's role in the transaction, factually and without straying into conclusions that belong to the court on other doctrines.
Contemporaneous medical, care and professional records can be especially useful because they show what was observed near the material date. Read them alongside the transaction papers, the person’s communications and witness evidence. Assess proximity, purpose, detail, consistency and possible interest in the outcome. No category of evidence is automatically decisive, and missing records should be identified rather than filled with assumptions.
Identify each disputed act, date, legal question and relevant records, including evidence that may not favour the instructing party. Agree the expert’s scope and any questions for the lawyer. For civil expert evidence, check CPR Part 35 and its permission requirements; a Court of Protection application follows its own rules and directions. The report must distinguish instructions, facts, assumptions, analysis and limits, with the overriding duty to the court where applicable.
A reasoned opinion may identify the capacity issues, evidence gaps and range of reasonable conclusions, helping the parties and their lawyers decide the next steps. It cannot predict settlement, determine whether a claim should succeed or replace the court’s assessment. The relevant burden of proof depends on the legal claim and must not be assumed to be identical for wills and all lifetime transactions.
The report should identify each disputed act, its date and its governing test, present the chronology and sources with provenance, establish the transaction's significance to the estate where proportionality applies, run the functional analysis on contemporaneous evidence, keep the parallel doctrines factually noted but analytically separate and conclude on each act with calibrated confidence. Built for adversarial reading, it should show its working at every step.
Identify each act, the correct legal framework and date, then explain what the surviving evidence supports and what remains uncertain. Keep capacity separate from undue influence, knowledge and approval, and other validity questions. Seek legal advice on the dispute and court requirements before commissioning expert evidence.
No. A diagnosis alone does not establish incapacity. For a Mental Capacity Act decision, provide practicable support, examine understanding, retention, use or weighing and communication, then explain whether any inability is caused by an impairment or disturbance of mind or brain. The conclusion is specific to the decision and time.
Relevant sources may include medical and care records, solicitor files, bank activity, correspondence, previous wills and witness accounts. Assess the detail, context, date and reliability of each source rather than assigning a universal hierarchy. Explain which evidence supports each part of the opinion and what is missing.
A retrospective opinion is most useful in probate disputes, contested lifetime gifts or transfers, professional negligence claims and Court of Protection questions about past decisions. It should be commissioned early, because a clear expert view on the strength of the capacity evidence often shapes whether a claim is worth pursuing at all. A conclusion about one decision does not establish capacity for another.
The related pages below explain connected decisions, evidence requirements and legal processes.
Before seeking a report, write down the exact decision, relevant date, reason for concern and intended use. Gather the documents that explain the real options and any communication needs. Check any required form or court direction, agree the scope and total fee, and clarify how missing evidence or further questions will be handled.
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