LONDON (Reuters) - Mick Jagger will learn the size of the dent to his 150-million-pound ($240 million) fortune when Jerry Hall takes their contested marriage to a British divorce court on Friday. Whatever the outcome, the battle looks set to be bitter as lawyers for the Rolling Stones frontman will argue that his 1991 wedding to the Texan supermodel on the Indonesian island of Bali was not legal under British law. Jagger has been criticised for trying to minimise how much he will have to pay Hall, who is reportedly seeking up to 30 million pounds, by insisting the marriage was invalid. But legal experts say the couple‘s 22-year relationship will have more bearing on the settlement than their marital status. Hall, who filed for divorce last Christmas, has hired the same law firm that won the late Princess Diana a 17 million pound settlement from heir to the British throne Prince Charles.