Tory leadership contest to start 10 June, I am told, writes Robert Peston

Put 10 June in your diary. Because that is when the contest to elect a new Tory leader, and therefore a new prime minister, will begin, I am told. Why am I confident of that? Well it is the last possible date for the contest that the shop stewards for Tory MPs, the executive for the 1922 committee, deem acceptable. And - perhaps more importantly - it is the date that the PM has signalled to her closest allies that she can tolerate.