John Mann has taken a seat in the Lords, ending 18 years as a Labour MP.
He stood down to take up a post as a cross bencher.
Prime Minister Theresa May appointed Mr Mann to the Lords in her resignation honours list.
She’s asked the former Bassetlaw MP to head up an inquiry into anti-Semitism.
Mr Mann, 59, has been a constant critic of Labour leader Jeremy Corbyn and the anti-Semitic row that dogs the party.
The move, however, is also bad news for Boris Johnson.
Mr Mann has been a staunch Leave supporter in the House, often voting with the Tories.
At the last election Mr Mann had a majority of 4,852 – reduced by half.
In the Brexit referendum the North Nottinghamshire constituency voted by 67 per cent to leave the EU.
Labour has nominated London based Sally Gimson as their candidate – an EU supporter.
It’s a “blue-collar” seat where the Conservatives would fancy their chances.