Who has submitted letters of no confidence in UK PM May?

"The writing has been on the wall for some time," she said on Twitter on Thursday.

14) MARTIN VICKERS - submitted his letter in July

"It was clear at that time further concessions were inevitable & now we have a much worse agreement that fails to deliver what my constituents voted for in the referendum when they delivered a considered verdict that we should leave," he told a local newspaper reporter.

15) ADAM HOLLOWAY - submitted his letter on Thursday

"My letter of no confidence has now been delivered - with regret. Mrs May is a remarkable woman - just look at her fortitude today in the House of Commons, even more please remember her long career of public service."

16) JOHN WHITTINGDALE - told the BBC on Friday

"Yes, I have sent a letter to Graham Brady"

17) LAURENCE ROBERTSON - told the BBC his letter was submitted months ago

"I was concerned at the direction Theresa May was taking these negotiations and was dragging them out, and I wrote that letter some months ago."

18) MARK FRANCOIS - said he had submitted his letter, titled "She Just Doesn't Listen", on Friday

"For the sake of the Conservative Party and indeed for our country's destiny, I honestly believe that (it) is now time to seek fresh leadership that can carry this country forward outside of the European union and confidently into the world."

19) MARIA CAULFIELD - confirmed via her office that she has submitted a letter.

20) BEN BRADLEY - confirmed via his office that he has submitted a letter.

21) CHRIS GREEN - said on Twitter he had sent a letter.

"My constituents want a clean break from the European Union, taking back control of our laws, our borders, our money and our trade. The withdrawal proposal from the prime minister will not help deliver that result."