In English law, a person’s will is an essential expression of their wishes, dictating how their property and assets will be distributed after their death. The principle of testamentary freedom allows individuals to distribute their estate according to their own wishes, free from external pressure or coercion. However, when someone is forced, manipulated, or unduly influenced into making a will, this freedom can be compromised. This is where the legal concept of undue influence comes into play, and it has significant implications for the validity of a will.
What Is Undue Influence?
Undue influence occurs when a person is pressured or coerced into making a decision they would not otherwise have made, overriding their free will. In the context of a will, it typically refers to a situation where a testator (the person making the will) is manipulated by another party—often a relative, friend, or caregiver—to make provisions in the will that benefit the influencer to the testator’s detriment.
For a claim of undue influence to succeed in challenging a will, it must be proven that the testator’s actions were not entirely their own but were instead the result of pressure that deprived them of their ability to act independently. This can be a complex and sensitive matter, and is typically difficult to prove in court, but English law does provide protections against this type of exploitation.
How Does Undue Influence Affect a Will?
If undue influence is proven, the court can invalidate the will in question. The key test is whether the testator’s decision to make a will—or certain provisions within it—was made freely and without coercion. The law seeks to ensure that wills reflect the true intentions of the deceased and not the wishes of someone who has applied pressure, whether direct or indirect.
Recognising Undue Influence in Practice
There are several indicators that might suggest undue influence in the creation of a will. These can include:
1. Isolation from Family and Friends: If the testator is isolated from other loved ones and spends an inordinate amount of time with the person allegedly exerting influence, it raises suspicion.
2. Sudden and Unexplained Changes in a Will: A drastic change in the distribution of assets, especially if it favours a specific individual, can suggest that the testator may have been influenced against their wishes.
3. Physical or Mental Decline of the Testator: If the testator is elderly, ill, or suffering from mental incapacity, they may be more vulnerable to manipulation. However, this does not automatically mean undue influence is present—context matters.
4. Pressure During Will Execution: If the testator seems to have made the will under duress or after being repeatedly told how to distribute their estate, this could indicate undue influence.
5. Suspicious Behaviour of the Beneficiary: If the person benefiting from the will has been involved in persuading the testator to make particular provisions, or has taken an active role in arranging the will’s creation, their actions may be questioned.
Legal Protections
English law takes allegations of undue influence seriously and offers several layers of protection to safeguard the testamentary freedom of individuals:
1. Burden of Proof: In cases involving undue influence, the burden of proof lies with the person challenging the will. They must demonstrate, on a balance of probabilities, that undue influence occurred. Simply alleging it is not enough; there must be clear evidence of coercion or manipulation.
2. Presumption of Undue Influence: In some cases, there may be a presumption of undue influence. This typically occurs where the person benefiting from the will has a position of trust or authority over the testator—such as a caregiver or financial advisor. If the testator has left a significant portion of their estate to this person, a court may scrutinise the circumstances more closely.
3. Capacity and Voluntary Decisions: English law also requires that a testator has the mental capacity to make a will and that their decisions are made voluntarily. Even if there is no direct proof of undue influence, a will can be contested if the testator lacked the mental capacity to understand the nature of the act they were undertaking.
4. Independent Legal Advice: To avoid accusations of undue influence, it is advisable for testators to seek independent legal advice when drafting their wills, particularly if there are concerns about potential pressure or manipulation from others. A solicitor or Will Writer can ensure that the testator’s intentions are clearly documented and that they understand their decisions.
Challenging a Will on the Grounds of Undue Influence
If a person believes that undue influence has affected the contents of a will, they may bring a claim under the Inheritance (Provision for Family and Dependants) Act 1975 or under common law. However, challenging a will on the grounds of undue influence is no small matter. Legal proceedings can be costly, emotionally draining, and time-consuming, especially as courts require compelling evidence to support such claims.
Even when a claim is successful, the court’s primary objective is to respect the deceased’s intentions. It will only overturn or modify a will where it is clear that the testator’s free will was compromised.
Conclusion
The creation of a will is a very personal act, and English law is designed to protect the testator’s testamentary freedom to decide how their estate should be distributed. Undue influence undermines that autonomy, and English law provides legal remedies to challenge a will when manipulation or coercion is suspected.

For those preparing a will, it is crucial to ensure that the process is conducted transparently and with the testator’s full and voluntary consent. Seeking independent legal advice, particularly where there are concerns about potential undue influence, can help ensure that the will reflects the genuine intentions of the individual, providing peace of mind for all parties involved. If in doubt, or where the terms of the will are likely to prove contentious, a formal, independent testamentary capacity assessment will make the will more robust.
Chiltern Wills is a Will writing business based in Beaconsfield and run by former London solicitor Rebecca D’Arcy. Call or email us for a free initial chat about how we can help with Wills, Lasting Powers of Attorney or Probate.