Veteran British actor Sir Ian McKellen is urging fans to sign a petition demanding U.K. politicians step up action to help the homeless.

The Lord of the Rings star is backing a campaign by Crisis, a charity which aims to end homelessness in Britain, and he is asking devotees to put their names to a petition aimed at the Government.

MCKellen has posted a link to the petition on his Twitter.com page and adds in a message, "Let's make homelessness #impossibletoignore (sic)."

A statement posed alongside the petition reads, "Many people walk by when they see someone sleeping in a doorway. But it's not just on the streets that homeless people get ignored. In parliament, politicians of all shades could do more to tackle homelessness."