There are rumours floating around that the current Prime Minister of the United Kingdom Boris Johnson may switch seats from his current Uxbridge and South Ruislip constituency to a safer Tory seat:
And as yet there is still no official confirmation that the prime minister is defending his Uxbridge and South Ruislip seat, where his majority is just 5,034, instead of moving to a much safer Tory seat. Sky News 14/11/2019
Have there been any previous cases where the incumbent Prime Minister has switched seats to try to ensure their continuation as an MP?