The unnamed member of the parliamentary Conservative party told Bloomberg political editor Kitty Donaldson that they had handed in their letter to the 1922 committee on Sunday night.

While Tory MPs say letters have been going in for more than a week, this may be the first report of an MP personally admitting they have sent one themself.

Current rules give Liz Truss until next September before she can be ousted – but these could be changed by MPs.