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Home » Beyond ‘unfairness’: The 5 legal grounds for contesting a Will

Contentious Probate
An image of a Will representing grounds for contesting a Will
Jan 2nd, 2026

At BLB Solicitors, our goal is simple – to deliver you clear, practical legal advice and cost-effective solutions. We hope you enjoy exploring our Blog. If you can’t find what you’re looking for, please do contact us.

Beyond ‘unfairness’: The 5 legal grounds for contesting a Will

Catherine GreenContentious Probate Solicitor Catherine Green presents a clear, compassionate guide to when a Will can legally be challenged.

Contact the Team on 01225 462871 or by email.

Losing a loved one is difficult enough without the added stress of concerns about their Will. It’s very common for people to feel that a Will is “unfair” — perhaps because expectations weren’t met, or relationships were more complex than the document reflects.

But in legal terms, unfairness alone is not enough to challenge a Will. To bring a successful claim, you need to show that specific legal grounds apply. Understanding these can help you decide whether your concerns may have a valid legal basis.

Use this tool to find whether probate has been obtained in the estate >>

Lack of testamentary capacity

For a Will to be valid, the person making it must have had the mental capacity to understand what they were doing at the time. This includes knowing the extent of their estate and who might reasonably expect to benefit.

Concerns often arise where the deceased was suffering from conditions such as dementia, serious illness, or confusion. If capacity is in doubt, medical evidence and witness testimony can become crucial.

Undue influence

A Will must reflect the true wishes of the person making it — not the pressure or manipulation of someone else. Undue influence can be difficult to prove, but it may be suspected where:

  • A beneficiary was heavily involved in the Will’s preparation
  • The deceased was vulnerable or dependent
  • The terms of the Will seem out of character

These cases frequently necessitate a thorough examination of the relationships and circumstances surrounding the signing of the Will.

Lack of knowledge and approval

Even if a Will appears valid on the surface, it can be challenged if the person signing it did not fully understand or approve its contents. This can happen where:

  • The Will was prepared by someone else without proper explanation
  • The deceased had visual, literacy, or language barriers
  • There are suspicious circumstances surrounding its execution

Improper execution

There are strict legal rules about how a Will must be signed and witnessed in the UK. For example, it must usually be signed in the presence of two independent witnesses who also sign it. If these formalities are not followed correctly, the Will may be invalid — regardless of the deceased’s intentions.

Fraud or forgery

In rare but serious cases, a Will may be challenged on the basis that it is fraudulent or forged. This might involve:

  • A signature that is not genuine
  • Alterations made without proper authorisation
  • A completely fabricated document

Such claims require strong evidence, often including handwriting experts and forensic analysis.

When “unfair” still matters

Even if none of the above grounds applies, you may still have options. Certain individuals — including spouses, children, and dependants — may be able to bring a claim under the Inheritance (Provision for Family and Dependants) Act 1975 if they have not been left reasonable financial provision.

Learn more about your options and how claims work by visiting our dedicated page on Contentious Probate.

Taking the next step

If you’re questioning a Will, it’s important to act promptly and seek clear legal advice. Disputes can be emotionally and legally complex, but early guidance can make a significant difference.

If you’re unsure whether your situation meets the legal threshold, speaking to a specialist can help you move forward with confidence — and clarity.

Call our specialist team on 01225 462871 or complete the Contact Form below.

Catherine Green
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