The torch, it appears, is being passed:

George Osborne is to cement his position to succeed David Cameron as Tory leader by standing in for him at Prime Minister’s Questions this week.
The Chancellor will appear at the Despatch Box at midday on Wednesday, taking questions from MPs on any subject. […]
During the campaign, Mr Cameron surprised many in his party by announcing he would quit before the 2020 election and tipping potential succesors.
The Tory leader said: ‘There definitely comes a time where a fresh pair of eyes and fresh leadership would be good and the Conservative Party has some great people coming up: the Theresa Mays and the George Osbornes and the Boris Johnsons.’
Mr Osborne will hope to use his first session of PMQs to put his own stamp on the job, having helped to brief every Tory leader on the clashes since 1994.