London Mayor Boris Johnson is desperate to be prime minister but would rather see David Cameron "fail miserably" at the next election than betray him, former government spin doctor Andy Coulson has said.
Mr Coulson, former No10 director of communications, advised Downing Street to support the mayor's good ideas, "advise privately on the bad ones, but only engage publicly if absolutely necessary - and celebrate Boris's considerable successes".
More top news
Facebook is to test a set of emoticons to add to the like button giving users more choice to react to their friends' status updates.
Nobel prize-winner and campaigner Malala Yousafzai speaks to ITV News about her political ambitions and her new Birmingham accent.
Spencer Stone, one of the three American men who thwarted the French terror attack in August, has been stabbed repeatedly.