One of David Cameron's senior advisers has left Downing Street to work for controversial pay day loan company, Wonga. Jonathan Luff was the Prime Minister's adviser on digital strategy and had been seconded to Downing Street from the Foriegn Office. He is free to begin his new role as Global Head of Public Affairs at Wonga immediatley. Wonga, which charges up to 4,215% APR on its loans, has been called a "legal loan shark" by long-running critic, MP Stella Creasy. Ms Creasy asked on her website wh...