Damon Albarn, Graham Coxon, Alex James and Dave Rowntree have clearly seen enough rockumentaries to know that they wanted this record of Blur's 2009 reunion to look more like Metallica: Some Kind of Monster than This Is Spinal Tap. But while all four are guardedly nostalgic in chronicling the combo's journey from an Essex comprehensive to headliners at the Glastonbury festival, they let slip enough affection and frankness to provide a fascinating insight into the dynamics of one of British music's most chameleonic bands. Expertly compiled by co-directors Dylan Southern and Will Lovelace from archive material, exclusive interviews and tour footage, this debunks several pop-star myths while demonstrating there's no substitute for talent, originality and hard work. It may not convert unbelievers and there are flashes of self-congratulation about the enterprise, but it's hard not to admire the artistic integrity that impelled Blur before it pushed Albarn and Coxon apart.