Kate Middleton, Britain’s Princess of Wales, said on Sunday she had scaled the three highest peaks in Britain in 24 hours to raise money for a cancer charity and “as a chance to explore life beyond diagnosis and to give something back”.Kate, 44, the wife of heir to the throne Prince William, is in remission after undergoing chemotherapy for an undisclosed form of cancer and, while she has returned to royal duties, she has spoken of the toll the illness has taken on her and her family.In a...