David Canzini has made quite an impression since he joined No. 10 as the Prime Minister’s deputy chief of staff in February. He’s there not just to provide focus but to make the operation feel a bit more traditionally Tory. At a recent meeting with government aides, Canzini, a former Tory party campaign director from the Lynton Crosby school of bluntness, asked for a show of hands: who was a signed-up Conservative party member? More than half the room.