Pre-Nuptial Agreements: Safeguarding Assets Amid Life's Uncertainties

Published on 21 July 2025 at 17:06

It’s no secret that relationships can evolve in unexpected ways. Just this week, the media has been awash with the furore surrounding the 'Coldplay couple' - Astronomer CEO Andy Byron and HR head Kristin Cabot - whose kiss-cam moment at a Coldplay concert exposed an affair, leading to scandal and his resignation. It's a stark reminder that even seemingly solid partnerships can falter, and when substantial assets are involved - whether from tech fortunes, business ventures, or family wealth - protecting them becomes paramount. In this article, we  draw on recent case law and legal insights to explore pre-nuptial agreements (pre-nups) in the UK: what they are, their enforceability, and key steps to make them as robust as possible.

What is a Pre-Nuptial Agreement?

A pre-nuptial agreement is a contract entered into by a couple before marriage, outlining how their assets, debts, and financial responsibilities will be divided in the event of divorce or separation. Unlike in some jurisdictions where pre-nups are automatically binding, in England and Wales, they serve as a framework to protect non-matrimonial property such as inheritances, pre-marital assets, or family businesses.

These agreements can cover a wide range of matters, including property division, spousal maintenance, and even provisions for children from previous relationships. They promote transparency by requiring full financial disclosure from both parties, fostering trust while clarifying expectations. However, pre-nups cannot override the court's jurisdiction under the Matrimonial Causes Act 1973 (MCA 1973), nor can they include clauses that waive the right to seek financial remedies entirely. Their primary goal is to minimise costly disputes by providing certainty, especially for high-net-worth individuals or those with international ties.

Are Pre-Nuptial Agreements Enforceable in the UK?

In short, pre-nups are not strictly binding in England and Wales, but they carry significant weight in financial remedy proceedings under section 25 of the MCA 1973. The landmark Supreme Court case of Radmacher v Granatino [2010] UKSC 42 shifted the landscape, establishing that courts should uphold a pre-nup if it meets a three-stage test: it was freely entered into, both parties fully appreciated its implications, and it's fair to enforce it in the circumstances.

Courts retain discretion to override an agreement if it would leave one party in "real need" or harm children's interests, as seen in Luckwell v Liman [2014] EWHC 502 (Fam) and DB v PB [2016] EWHC 3431 (Fam). For instance, in Radmacher, a German pre-nup was upheld where the husband waived claims on his wife's wealth, given his earning potential and provisions for children. Conversely, in Ipekci v McConnell [2019] EWFC 19, the agreement was disregarded due to inadequate legal advice and disclosure.

Recent cases underscore this flexibility. In NO v PQ [2023] EWFC 36, an informal post-nup via WhatsApp was enforced despite causing hardship, as both relied on it. However, in AH v BH [2024] EWFC 125, the wife's caregiving role led to adjustments for fairness. The Law Commission's December 2024 scoping report on financial remedies explores potential reforms, including qualifying nuptial agreements that would be binding except for needs or children's welfare, with the government's interim response pending as at the time of writing. Until reforms are enacted, enforceability hinges on judicial assessment, making professional guidance essential.

Factors That Can Undermine Enforceability

Several vitiating factors can reduce or nullify a pre-nup's weight, including mistake, misrepresentation, duress, and undue influence.

  • Mistake: This could be common (both parties mistaken about a key fact), mutual (cross-purposes on terms), or unilateral (one party exploits the other's error). While rare with legal advice, examples include misvaluing assets such as artwork.
  • Misrepresentation: Involves false statements inducing agreement, whether fraudulent (e.g. hiding bankruptcy), negligent (failing to update finances), or innocent (undervaluing heirlooms). Courts scrutinise disclosure, as in DB v PB where allegations failed due to thorough advice.
  • Duress: Improper pressure such as threats to cancel the wedding is assessed by its seriousness and alternatives available. In Hopkins v Hopkins [2015] EWHC 812 (Fam), no duress was found despite bullying claims, thanks to extended negotiations.
  • Undue Influence: Arises in trust-based relationships, either actual (proven pressure) or presumed (disadvantageous deal). Cases such as KA v MA [2018] EWHC 499 (Fam) show maturity and advice can counter claims.

The Law Commission suggests limiting presumptions for qualifying agreements, but currently, proving free will is key. Understanding these risks highlights the importance of expert drafting to avoid pitfalls.

Formalities to Maximise Enforceability

To align with Radmacher and boost chances of upholding, pre-nups must adhere to strict formalities:

  • Execution as a Deed: The agreement should be in writing, signed before independent witnesses (over 18), and include a testimonium clause. This avoids consideration issues, as marriage alone isn't sufficient.
  • Timing: It should be signed at least 28 days before the wedding to evade pressure claims. In AD v BD [2020] EWHC 857 (Fam), a day-before signing was invalidated amid emotional distress.
  • Financial Disclosure: Full, material details of assets, income, and inheritances must be provided in schedules. In Helliwell v Entwistle [2024] EWHC 740 (Fam), waived disclosure was accepted due to informed consent.
  • Independent Legal Advice: Each party requires legal advice on terms, effects, and disadvantages, with appended certificates confirming advice.
  • Relevant Statements and Warnings: Signed confirmations of understanding and prominent notices such as "DO NOT SIGN UNLESS YOU INTEND TO BE BOUND" should be included.

These elements demonstrate appreciation and fairness, enhancing judicial respect and protecting your interests.

Benefits and Considerations for Pre-Nuptial Agreements

Pre-nups offer numerous advantages, including clarity on non-matrimonial property, asset protection for businesses or heirlooms, and reduced litigation costs. They also safeguard against debts and ensure provisions for children from prior relationships. For international clients, they can address cross-border issues by specifying applicability in multiple jurisdictions.

However, drawbacks exist: they are subject to judicial discretion, may seem unromantic, and could become unfair due to unforeseen changes like illness or childbirth. Including review clauses for significant events, such as in AH v BH, helps maintain relevance.

At Blocksize Law, we tailor pre-nups to clients’ unique circumstances, navigating complexities to maximise enforceability while managing expectations.

While pre-nups provide valuable protection - as the Coldplay couple saga illustrates life's unpredictability - their success depends on expert preparation. If you're considering a pre-nup to secure your future, contact us for bespoke advice. 

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