Boris Johnson’s brother-in-law claims he was blocked from using currency exchange abroad because of his political links. Ivo Dawnay, who is married to the former prime minister’s younger sister Rachel, said he was told by an official at the bureau de change in the baggage hall of Mexico City airport he could not use the service owing to his status. Writing in The Spectator, Mr Dawnay said that while attempting to exchange $200 (£160), he was asked to fill out several forms, one of which asked him if he was a “politically exposed person”, otherwise known as a PEP, after...