Boris Johnson is facing a no-confidence vote this evening after Sir Graham Brady, chair of the 1922 Committee, announced the threshold of 54 letters had been reached to trigger the vote.

       The vote, which takes place in the wake of the Partygate scandal and Sue Gray report, will take place between 6pm and 8pm, with the results expected around 9pm.

       Earlier on Monday, John Penrose, the prime minister’s anti-corruption champion resigned.

       Announcing his decision by letter to the prime minister Mr Penrose said the Sue Gray report had revealed the PM had broken “a fundamdental principle of the ministerial code”.

       “I’m afraid it wouldn’t be honourable or right for me to remain as your anti-corruption champion after reaching this conclusion nor for you to remain as prime minister.

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       “I hope you will now stand aside so we can look to the future and choose your successor.”

       We want to know who you think that successor should be if Johnson is voted out or decides to step down.

       According to Betfair Exchange, former health secretary Jeremy Hunt is the favourite to become next Tory leader. Other names in the mix include Jeremy Hunt, Liz Truss, Tom Tugendhat, Penny Mordaunt, Rishi Sunak, Ben Wallace, Nadhim Zahawi and Sajid Javid.

       Scroll down and vote in our reader poll. Then check back for the results.

       If you selected ‘other’, ‘don’t know’ or ‘don’t care’, let us know in the comments why.