It will take over 180 MPs to topple Boris Johnson and while more than 54 have sent in letters of no-confidence to trigger a vote many others have remained silent.
All the senior Cabinet Ministers have rushed to the ramparts to defend the Prime Minister, although declarations of loyalty on Twitter do not necessarily translate into votes of support in a secret ballot.
Potential rival Jeremy Hunt has declared his will be a vote for change and Penny Mourdant, the Trade Minister with ambitions, has remained silent.
