[4] During this time, alongside many other Scottish IMG activists, he joined Jim Sillars' fledgling Scottish Labour Party (SLP) using entryist tactics, a process that resulted in a purge of the IMG-associated members by Sillars at the party's first conference in October 1976.

[citation needed] Kerevan eventually stood successfully as the SNP candidate for East Lothian at the 2015 general election.

He won 25,104 votes, a majority of 6,803, and unseated the then-incumbent Labour MP Fiona O'Donnell.

[8] He subsequently lost his seat in the 2017 general election to Martin Whitfield of the Labour Party, who won with a majority of 3,083 votes over Kerevan.

[10] He stood for Lothian East at the 2024 general election, where he finished in seventh place out of seven candidates, winning 577 votes and a 1.2% share.