Michael Douglas and Matt Damon are among the latest Hollywood heavyweights who have joined calls for British officials to grant pardons to thousands of gay men who were prosecuted when homosexuality was illegal in the U.K.

The two actors, who played lovers in Liberace biopic Behind the Candelabra, have signed a petition which was launched last month (Jan15) in honour of Alan Turing, the gay World War Ii codebreaker played by Benedict Cumberbatch in Oscar-nominated movie The Imitation Game.

The petition has been gathering speed since Cumberbatch threw his weight behind it, and other stars who have now given their backing include Jessica Alba, Ryan Reynolds, Channing Tatum and Bryan Cranston, while previous signatories include Cumberbatch's The Imitation Game co-star Keira Knightley, director Sam Taylor-Johnson, actor Matthew Goode, and moviemaker Lee Daniels.

As Wenn went to press, the petition had gained more than 200,000 signatures.