While prenuptial agreements are not always legally binding in the UK, they are increasingly being taken into account by courts, especially if they meet certain criteria.
While they are recognised in the UK courts, they can actually be vetoed if there are terms of the agreement deemed as unfair or discriminatory for instance.
For a prenup to hold up in court, it must be fair, entered into freely by both parties, with full financial disclosure and independent legal advice.
Courts will consider the terms of the agreement as part of the overall context when making financial settlements in divorce cases; the best way to ensure that it is held up in a UK courtroom is to ensure that the prenup is well-drafted and meets legal standards.