Questions about mental and testamentary capacity can arise when there are concerns that a Will may not reflect the true intentions of the person who made it. In contentious probate disputes, one of the most common issues is whether the person making the Will had the mental ability required to do so at the time the Will was signed.

If there are genuine concerns that they did not, the validity of the Will may be challenged. These cases are often sensitive and fact-specific, particularly where family members disagree about whether the Will should stand.

At Butcher & Barlow, our experienced Contentious Probate Solicitors provide clear and practical advice to individuals who are concerned that a Will may be invalid due to a lack of testamentary capacity. We understand the emotional and legal difficulties these disputes can bring, and we work carefully to investigate the circumstances and help you reach a fair and sensible outcome.

Get expert advice on mental capacity in contentious probate

If you would like advice about mental capacity and testamentary capacity, please contact our Contentious Probate Solicitors on 0161 764 4062 or email enquiries@butcher-barlow.co.uk.

Why choose Butcher & Barlow for support with testamentary capacity?

Disputes about mental capacity and Wills can be particularly sensitive, often involving complex medical evidence,  difficult family dynamics and disagreements about a loved one’s wishes. Where there are any concerns about mental capacity and how it might affect the validity of a Will, seeking professional advice at an early stage can help clarify whether there may be grounds to make a challenge and what this will mean moving forward.

At Butcher & Barlow, our Solicitors have extensive experience handling contentious probate matters, including cases involving allegations of a lack of testamentary capacity. We explain your options clearly, without unnecessary legal jargon, and help you understand both the legal issues and the practical steps involved.

Our team works proactively to investigate the facts, gather evidence and explore practical ways of resolving disputes. Where possible, we aim to resolve matters through negotiation or mediation. However, when court proceedings are necessary, we provide strong and effective representation throughout.

In every case, we work with you, not just for you, ensuring that the important decisions are shared and you feel supported at each stage.

What is testamentary capacity?

Testamentary capacity refers to the legal ability of a person to make a valid Will.

In order for a Will to be legally valid, the person creating it must have sufficient mental capacity at the time it is made. This means they must understand what they are doing and the consequences of the decisions they are making about their estate.

It is important to highlight that testamentary capacity is different from general mental capacity. A person may have difficulty with some decisions in daily life and still have testamentary capacity, depending on the nature of their condition and their understanding at the time the Will was made. Equally, a diagnosis such as dementia does not automatically mean that a Will is invalid. The question is whether the person met the legal test at the relevant time.

If it can be shown that the person lacked testamentary capacity when the Will was made, the Will may be declared invalid. The estate may then pass under an earlier valid Will or, if there is none, under the intestacy rules.

The Banks v Goodfellow test

The legal test used to assess testamentary capacity comes from the case of Banks v Goodfellow.

In broad terms, the person making the Will must:

  1. understand the nature and effect of making a Will
  2. understand the extent of the property or estate they are distributing
  3. be able to consider the claims of those who might reasonably expect to benefit from their estate
  4. not be affected by any disorder of the mind or delusion that influences the way they distribute their estate

The courts have also made clear that this is not simply a memory test. A person does not need perfect recall of every detail of their estate, but they do need the ability to make a rational testamentary decision in the context of the Will they are making.

Medical conditions that may affect capacity

Certain medical conditions can affect testamentary capacity, including dementia, Alzheimer’s disease, mental illness, brain injury or the effects of medication. However, the existence of a condition is not enough on its own. The court will look at the person’s understanding and decision-making ability at the time the Will was made. It is important to remember that having a medical condition does not automatically mean a person lacks capacity. Each situation must be assessed based on the individual’s condition and their ability to satisfy the legal test at the time the Will was prepared and signed.

When can a Will be challenged on capacity grounds?

Concerns about testamentary capacity often arise when a Will departs sharply from previous arrangements, excludes close family members, introduces unexpected beneficiaries or is made at a time when the person was unwell, confused or particularly vulnerable.

A surprising Will does not automatically mean there was no capacity. The courts recognise that people are free to make Wills that others may regard as unfair or unexpected. But where the terms are unusual, and there is other evidence of impaired understanding, that may justify closer investigation

Acting promptly is important. If probate has not yet been granted, it may be appropriate to enter a caveat to stop the grant while the validity of the Will is investigated.

Evidence required to challenge a Will

Evidence is central to any claim involving testamentary capacity.

Medical records often play an important role in determining whether the person making the Will had the necessary mental capacity at the relevant time. Expert medical opinions may also be required to interpret those records and assess their condition.

Witness evidence can also be important, particularly from the Solicitor who prepared the Will, the attesting witnesses and anyone else involved in taking instructions. If a Will was prepared by an experienced Solicitor who considered capacity carefully, that evidence may carry significant weight, although it is not conclusive.

The process of contesting a Will based on lack of capacity

Contesting a Will on the grounds of lack of testamentary capacity typically begins with an an initial review of the Will, the surrounding circumstances and the available evidence.

This may involve reviewing the Will itself, examining medical records and gathering information about the testator’s condition at the time the Will was prepared and signed.

Once the evidence has been assessed, the next step may be to raise concerns with the Executors or other parties involved. In many cases, disputes can be resolved through negotiation or mediation.

If an agreement cannot be reached, court proceedings may be necessary to determine the validity of the Will. Throughout this process, our Solicitors will guide clients through each stage and provide clear advice about the options available.

Defending a Will against capacity challenges

Executors or Beneficiaries may need to defend the validity of a Will against allegations that the testator lacked capacity.

Proper Will preparation procedures can play an important role in defending these claims. Evidence that the Will was prepared with the assistance of a Solicitor, along with medical assessments or detailed attendance notes, can help demonstrate that the testator had sufficient capacity.

Our team regularly advises Executors and Beneficiaries who need to defend a Will and provide guidance on how to respond effectively to challenges.

How Butcher & Barlow can help

At Butcher & Barlow, our experienced Contentious Probate Solicitors provide practical advice and support to individuals involved in disputes about testamentary capacity.

Our team can assist with gathering medical evidence, analysing legal issues carefully, reviewing the circumstances surrounding the Will and assessing whether there may be grounds to challenge or defend its validity.

Where possible, we aim to resolve disputes through negotiation or mediation in order to minimise stress and legal costs. However, when court proceedings are required, we provide clear guidance and strong representation throughout the process.

Our goal is to help you navigate complex probate disputes while ensuring you feel informed, supported and confident in the decisions being made.

Get expert advice on mental capacity in contentious probate

If you would like advice about mental capacity and testamentary capacity, please contact our Contentious Probate Solicitors on 0161 764 4062 or email enquiries@butcher-barlow.co.uk.

Lack of testamentary capacity FAQs

Testamentary capacity refers specifically to the ability to make a valid Will. It has a lower threshold than general mental capacity under the Mental Capacity Act 2005 and focuses on whether the person understood the nature and consequences of making a Will.

Yes. A diagnosis of dementia does not automatically mean someone lacks testamentary capacity. The key question is whether they met the Banks v Goodfellow test at the time the Will was made.

The Banks v Goodfellow test is the common law test used by the courts to assess testamentary capacity. It requires that the person making the Will understands the nature of making a Will, the extent of their estate, potential Beneficiaries and is not affected by a disorder of the mind.

There is no strict statutory limitation period for challenging the validity of a Will. However, it is usually advisable to act quickly, ideally before probate has been granted.

Evidence may include medical records, witness statements, expert medical opinions and documentation relating to the preparation of the Will. Evidence created at the time the Will was made is often particularly important.

Generally, the person challenging the Will must raise sufficient evidence to question capacity. Once reasonable doubt is established, the burden may shift to the person defending the Will to demonstrate that the testator had testamentary capacity.

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