Restrictive covenants in England and Wales are governed not by a single statute but by the common law doctrine of restraint of trade, a body of case law stretching back more than a century. The starting position is hostile to the employer: any covenant that restricts a former employee's freedom to work is void as an unreasonable restraint of trade unless the employer can show it protects a legitimate business interest and is no wider than reasonably necessary to do so. The three recognised legitimate interests are trade connections (client and supplier goodwill), confidential information, and stability of the workforce. A covenant drafted to suppress ordinary competition, rather than protect one of those interests, fails.
The leading authority is Tillman v Egon Zehnder Ltd [2019] UKSC 32, the first restrictive covenant case to reach the Supreme Court in roughly a century. The court confirmed that a restraint will be enforced only where it protects a legitimate interest, such as confidential information or customer and staff connections, to a reasonable extent. Tillman also revived the blue pencil test: where part of a covenant is too wide, a court may strike out the offending words and enforce the remainder, but only if the deletion needs no rewriting and does not change the overall character of the restraint. A restriction that is obviously too broad cannot be rescued by severance, and the courts continue to take a cautious approach to cutting down post-employment restraints. The practical lesson is blunt : sloppy drafting is not saved by a judge's goodwill.
Reasonableness is judged at the date the covenant was entered into, not the date you try to enforce it. A later promotion will not turn an invalid covenant into a valid one, so covenants should be refreshed whenever an employee's role materially changes. Trade secrets carry an additional layer of statutory protection under the Trade Secrets (Enforcement, etc.) Regulations 2018, which sit alongside the common law duty of confidence; the official text is published by the National Archives' record of the Trade Secrets Regulations 2018. One point every employer should track: the Department for Business and Trade opened a consultation in November 2025 on capping or reforming non-compete clauses, with options ranging from a statutory limit to an outright ban. No legislation has been enacted, so the common law rules above remain fully in force, but the direction of travel is towards tighter control. Our UK settlement agreement template is the right tool when covenants need to be reaffirmed or renegotiated on exit.