If the EP say we have resigned when we have not formally resigned they will open the door for protracted legal arguments which could delay our resigning until after those have concluded.
Arguably since Cameron has stood down and stated in our parliament that his successor is responsible for notifying the EP, he no longer has the authority to resign and nothing he now says can be taken as our resignation. Arguably he could resign. But resolving that would take more time than waiting for PM Hunt to be selected and to hand in our notice.
He's stood down from any responsibility for implementing the result. He's made a statement to parliament to that effect so removed any ambiguity for anything he says today to be misinterpreted as our resignation.
If the EP say we have resigned when we have not formally resigned they will open the door for protracted legal arguments which could delay our resigning until after those have concluded.
Arguably since Cameron has stood down and stated in our parliament that his successor is responsible for notifying the EP, he no longer has the authority to resign and nothing he now says can be taken as our resignation. Arguably he could resign. But resolving that would take more time than waiting for PM Hunt to be selected and to hand in our notice.