Will Disputes UK: Types, Grounds & What to Do

What this document is

A will dispute is a formal challenge to the validity of a will, or a claim against the estate left behind, brought in the courts of England and Wales. The law recognises that a will is a serious legal document and generally treats it as valid once admitted to probate, but that presumption can be rebutted where there is good reason to doubt it.

Disputes tend to fall into two broad groups. The first group attacks the will itself, arguing that it should not stand at all because of how it was made or the state of mind of the person who made it.

The second group accepts the will is valid but argues that it fails to make reasonable financial provision for someone who depended on the deceased. Both routes have strict procedural rules, tight time limits, and a strong evidential burden on the person bringing the challenge. Understanding which category a concern falls into is usually the first practical step.

How to use this document

1. Lack of testamentary capacity. This is the argument that the person making the will (the testator) did not have the mental ability to understand what they were doing at the moment the will was signed. The courts apply a long-standing test that looks at whether the testator grasped the nature of making a will, roughly what they owned, who might reasonably expect to benefit, and whether any disorder of the mind was affecting their choices. Conditions such as dementia, stroke, severe depression, or the effects of strong medication can all feed into a capacity challenge, but medical records and contemporaneous evidence usually carry the most weight.
2. Undue influence and coercion. Here the claim is that the testator was pressured into making a will that did not reflect their own wishes. The pressure has to go beyond ordinary persuasion, flattery, or family politics: the courts look for conduct that overbore the testator's free will. These cases often involve an elderly or isolated person and someone close to them who controlled access, finances, or daily care. Undue influence is notoriously hard to prove because it usually happens behind closed doors, and the burden sits firmly on the person making the allegation.
3. Forgery and fraud. A will can be challenged on the basis that the signature is not genuine, that pages have been swapped or altered, or that the testator was tricked into signing something they did not understand to be a will. Forensic handwriting experts, document examiners, and evidence from the witnesses who were present at signing all play a part. Fraud is a serious allegation and the courts expect clear, cogent evidence before setting a will aside on this ground.
4. Want of knowledge and approval. Even where capacity and signature are not in question, a will can still fail if the testator did not genuinely know and approve its contents. This often crops up where someone who benefits heavily under the will was also involved in drafting it, or where the testator was blind, deaf, illiterate, or reliant on a translator. Suspicious circumstances shift the focus onto the person relying on the will to show that the testator really understood what they were signing.
5. Improper execution and rectification. A will in England and Wales must meet the formalities set out in the Wills Act 1837: it must be in writing, signed by the testator, and witnessed correctly by two people present at the same time. A will that falls short of these rules can be declared invalid. Separately, where a will contains a clerical error or fails to carry out the testator's clear instructions, the court has a limited power to rectify it so it reflects what was actually intended.
6. Claims under the Inheritance (Provision for Family and Dependants) Act 1975. This is different from attacking the will itself. Certain categories of people, including spouses, civil partners, former spouses who have not remarried, children, cohabitees of at least two years, and others who were being maintained by the deceased, can ask the court to order reasonable financial provision from the estate. The claim usually has to be brought within six months of the grant of probate, so timing matters enormously.

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