The deal was sealed by the Works UK Distribution's managing director Mick Southworth and director of marketing Laurence Gornall, and CAA's Micah Green and Brian Kavanagh-Jones.
The film is about Toronto-based metal band Anvil, who had a 1982 hit album and try to find fame and fortune again 26 years later.
The film premiered at Sundance 2008 and then picked up prizes at Galway, Los Angeles and Sydney.
Rebecca Yeldham produced.
Mick Southworth said: 'We at the Works UK Distribution constantly strive to find the very best on offer in the independent film production arena and Anvil! The Story of Anvil is a simply remarkable piece of work. Already gaining momentum as a firm favourite of audiences around the world, we are very proud to be releasing such a fine movie in the UK. It underlines not only our growth and commitment, but also our acquisition expertise in this sector.'