Actor Idris Elba vowed to help a little-known British band by directing their promo film after he was blown away by the frontman's rock 'n' roll antics.

The Wire star saw a gig by The Last Party at a tiny venue in London earlier this year (13) and he was so determined to capture singer Liam Manton on camera, he offered to helm a promo video for free.

He joined the musicians in their hometown of Manchester, England this month (Apr13) to direct the shoot, which features several local landmarks and will accompany the group's next single A Thousand Smiles.

Elba tells NME magazine, "Liam's just a f**king monster onstage. He's one of the last frontmen standing... He was playing hard, bashing the strings and slamming the pedals - real rock 'n' roll. He's a character, and I wanted to capture that personality."

The Brit previously directed a video for folk rockers Mumford & Sons.