Contesting a Will in England and Wales: Grounds Explained in Plain English

Contesting validity vs disputing the outcome

Families often say they want to "contest the will" when they mean they feel the distribution is unfair. In legal terms, contesting validity is a specific route: arguing the will itself should not be admitted to probate because of a defect in how it was made or the circumstances surrounding it.

That is different from an Inheritance Act claim, where the will is assumed valid but a court is asked to make greater financial provision for someone who qualifies. Different evidence, deadlines, and outcomes apply. Confusing the two routes wastes time and money.

This guide describes common validity grounds in England and Wales for informational preparation. It does not state whether any ground applies to your circumstances — that requires professional advice on the specific facts.

Lack of testamentary capacity

For a will to be valid, the person making it must have testamentary capacity at the time of signing. The classic formulation requires them to understand the nature of making a will, the extent of property they are disposing of, the claims of people they ought to consider, and not be suffering from a disorder of the mind that poisons their affections or prevents rational decision-making.

Capacity is judged at the moment of signing, not years earlier or later. A person with dementia may still have capacity on a good day; a person without diagnosis may lack capacity if confused or heavily medicated. Medical records, GP notes, solicitor attendance notes, and witness observations all feature in evidence.

Wills made shortly before death or after diagnosis attract scrutiny, but late changes are not automatically invalid. The question is whether the deceased understood what they were doing when they signed. Professional will-writers who assessed capacity at the time create contemporaneous evidence that cuts both ways.

Undue influence

Undue influence means pressure that overbore the deceased's free will — not ordinary family persuasion or emotional appeals. The influenced person must have been coerced into making a will they did not truly want. Proving it is difficult because the deceased cannot give evidence and influence often happens in private.

Courts look for suspicious circumstances: a will favouring someone in a position of trust who was present throughout, isolation of the deceased from other family, sudden changes benefiting one person, or a beneficiary heavily involved in arranging the will. The burden of proof can shift in some cases once suspicion is established.

Carers, new partners late in life, and adult children who managed finances are commonly alleged influencers. Allegation alone does not prove influence. Documentary trails — who contacted the solicitor, who attended appointments, changes to care arrangements — matter greatly.

Fraudulent calumny and forgery

Fraudulent calumny is a specific form of fraud where one person poisons the deceased's mind against another beneficiary by telling lies. The deceased must have acted on those lies when deciding how to distribute the estate. It differs from undue influence but overlaps in practice.

Forgery — a will or signature fabricated entirely — is rarer but serious. Handwriting analysis, paper type, witness testimony, and solicitor file records may be examined. Electronic or poorly witnessed homemade wills increase uncertainty about authenticity.

Fraud claims require clear evidence of dishonesty, not merely that someone was economical with the truth in family arguments. The standard of proof in civil cases is balance of probabilities, but judges expect substantiation beyond suspicion.

Improper execution and revocation

The Wills Act 1837 requires wills to be in writing, signed by the testator (or at their direction in their presence), and witnessed by two people present at the same time who then sign. Failures in witnessing — wrong order, beneficiaries as witnesses, video-link attempts that do not meet rules — can invalidate a will or a gift to a witness.

DIY wills and handwritten codicils frequently fail execution rules. Small errors can have large consequences. Solicitor-drafted wills are less vulnerable but not immune if signing procedures were not followed in the office.

A later valid will revokes earlier ones. Destroying a will with intention to revoke can also apply. Disputes arise where multiple documents exist or where someone claims the deceased destroyed a will under pressure.

Knowledge and approval

Even where capacity and execution appear sound, a claimant may argue the deceased did not know and approve the will's contents — for example because they could not read English, were not told what the document said, or signed the wrong paper.

This ground often combines with others. A will prepared in a language the deceased did not understand, or signed in a rushed hospital setting without explanation, may raise knowledge-and-approval questions even if witnesses were present.

Solicitors who read the will back to the client and note their confirmation create strong evidence of knowledge and approval. Homemade documents without that safeguard are more exposed.

Procedure, costs, and realistic expectations

Validity challenges are typically brought in the High Court or, for lower-value estates, may involve probate registry processes such as caveats and warnings. Litigation is expensive, slow, and uncertain. Legal costs may come from the estate, reducing what everyone receives.

Many disputes settle before trial through negotiation or mediation. Entering litigation with organised records — medical notes, solicitor files, timeline of will changes — improves decision-making even if settlement is the outcome.

Probate caveat applications exceeded 11,000 in recent periods — a sign that many families pause grants while investigating concerns. A caveat does not by itself invalidate a will; it buys time for enquiries.

Preparation before seeking legal advice

Before a solicitor consultation, gather: the will and any earlier versions; death certificate; grant of probate if issued; medical records you can lawfully obtain; notes on who was present when wills were made; and a chronological narrative of events.

Identify what you are trying to understand — validity, provision, executor conduct — rather than asking a professional to resolve family feelings. Organised preparation makes first meetings more productive.

The KinClarity Inheritance Dispute Early Intervention Assessment structures early conflict signals and record gaps; it does not assess legal merits of contesting a will or predict outcomes.

The KinClarity Inheritance Dispute Early Intervention Assessment helps individuals identify early conflict signals, record gaps, and communication risk patterns in an estate — before a dispute becomes a formal legal claim.

Related articles

• Inheritance disputes complete guide (pillar)
• Blended Family Inheritance: Where Disputes Start and How to Prepare
• The Inheritance Act 1975 Explained: Who Can Claim and How It Works
• Executor Disputes With Beneficiaries: Common Causes and How to De-escalate
• Probate Caveats Explained: How They Work and What They Do Not Do