The Supreme Court ruled today that pre-nuptial agreements in the UK are legally binding in a case that will have far-reaching ramifications for high-net worth couples in the country.

Eight of the nine justices at the UK's highest court ruled in favour of Katrin Radmacher, 40, a German millionaire heiress, who was fighting a legal battle over the validity of a pre-nuptial agreement with her ex-husband Nicholas Granatino, 39, a former JP Morgan investment banker from France.