Mr Sunak has faced claims of hypocrisy in 11 Downing Street after it was revealed his wife Akshata Murty does not pay UK tax on overseas income as a non-domiciled UK resident.
Speculation on potential replacements for Mr Johnson has been shaken up in recent days, with Liz Truss falling into 6/1 from 10/1 to be the next Tory leader, making her a joint favourite in the betting with Mr Sunak, who has been pushed out to 6/1 from 5/2.
Defence Secretary Ben Wallace has also made a move up to 12/1 from 33/1, while Labour leader Keir Starmer has been backed down to 10/3 favourite from 11/2 to be the next PM.
Lawrence Lyons, spokesperson for BoyleSports, said: “Rishi Sunak was all the rage in the next PM betting at one stage as he enjoyed a surge in popularity, seemingly off the back of his pandemic response measures. But the support has totally dried up in recent days and they’re turning to Liz Truss as a future leader instead, so we’ve had to slash her odds for Number 10 as a result.”