IF ANYONE doubted Ken Livingstone’s hankering to challenge BoJo at the next mayoral election, a recent riposte to a questioner at a seminar on employment rights should lay any doubts to rest. Challenged over the question of elderly people holding on to jobs and keeping youngsters from having a go, Ken declared that, though he would be a little older by the time the London contest is next fought, he would have no qualms about taking a job from a younger man.