By Michael Holden and Andrew MacAskill LONDON (Reuters) - In August last year, Fiona Shackleton, one of Britain's most prominent divorce lawyers, received an urgent late-night phone call from Cherie Blair, wife of the former prime minister Tony. Blair, who is a top human rights lawyer, told Shackleton that her phone may have been hacked along with that of her client, Jordanian Princess Haya bint al-Hussein. In subsequent conversations, the two women believed there was only one explanation: Shackleton was Haya's lawyer in her bitter London custody case with her ex-husband, Dubai's ruler Sheikh ...