Two women who say they were misled by their ex-husbands and should get more money in their divorce settlements have won their Supreme Court fight.
Alison Sharland, who accepted £10m in her divorce, and Varsha Gohil, who got £270,000, say the men hid the extent of their wealth when the deals were made.
Solicitors for Ms Sharland's ex-husband Charles said the ruling could "open the floodgates" to thousands of cases.
Ms Gohil said there were "no winners", but both spoke of the pair's relief.
The court indicated that both claims would return to the High Court.
BBC legal correspondent Clive Coleman said it was an "incredibly significant ruling" that meant a division of the parties' financial assets had to be based on a "valid agreement".
"If one of the parties is dishonest, if they are misleading about what their assets are, then this is a very clear signal that the other party can go back to court, can have the agreement set aside and can have the whole thing considered again," he said.