What do you do after you've been in the biggest band in the world? In Dave Grohl's case, you do it again. Dermot O'Leary links up with Dave Grohl in his studio in LA to look back on his time in Nirvana and 25 glorious years as frontman for Foo Fighters. From The Word to The White House via Wembley Stadium, Dave talks candidly about the key moments that have defined his career