Ive spent most of the past 10 years going to gigs and id find it difficult to name just one but some of the best have been:
Rancid - Brixton Academy 2003
Audioslave - Brixton Academy 2005
Metallica - Donnington 2006
Slayer - Brixton Academy 2007
Iron Maiden - Earls Court - 2007 (i think)
Rage Against the Machine - Reading Festival 2008
Slipknot - Donnington 2009
Metallica - Sonishpere 2011
Slipknot - Sonishphere 2011
Mastodon - Brixton Academy 2012
Stone Sour - Brixton Academy 2012
Soundgarden - Hyde Park 2012
Soundgarden - Shepherds Bush 2012