The Supreme Court Shows Why Handshake Deals Destroy Families

Two siblings, in their late fifties. They had not spoken in three years, except through solicitors. The fight was over their father's farm, an asset worth over £2 million.

The son had worked the land for 30 years on a wage of less than £200 a week. The father had always told him, 'One day, this will all be yours.' But when he died, his will from 20 years prior split the entire estate equally between the son and his sister, who had no involvement in the business. To give the sister her share, the farm would have to be sold.

This is not a rare story. A similar dispute over a family farm and a verbal promise went all the way to the UK Supreme Court, costing the family over £750,000 in legal fees and taking four years to resolve. The final judgment satisfied no one.

The catastrophic failure was a verbal promise that was never legally documented. In law, a claim can sometimes be made based on 'promissory estoppel'—where a promise was made, relied upon to one's detriment, and it would be unjust to go back on it. But this is a viciously expensive and uncertain argument to run in court. It pits one person's memory against another's, with the family legacy paying the solicitors' bills.

The will, a formal legal document, directly contradicted decades of informal assurances. The result was a legal bomb that detonated upon the father's death.

For UK families, especially those with business or agricultural assets, this is the lesson. A promise is not a plan. A will is often not enough. For a family business like a farm, a Limited Liability Partnership (LLP) can define roles, responsibilities, and succession. A members' agreement acts as a rulebook, specifying exactly what happens if a partner leaves, retires, or dies. This removes the ambiguity that fuels conflict. It also protects valuable Inheritance Tax reliefs, like Agricultural Property Relief, which can be jeopardised by a poorly structured estate.

Good planning is not about death. It is about preventing this outcome for the people you leave behind. If your arrangements rely on unspoken understandings, we should talk.