Singer was due to perform at the Harpa Concert Hall in Rekjavik
Singer-songwriter previously named London O2 Arena show his favourite of 2014
Singer wrote scathing article on his fan site last week
Singer describes 2014 tour as his "best ever"
Frontman said he was invited to go up against the Queen on Christmas Day
Singer revealed news on Serbian website
Frontman says Christmas Day is "not quite the time to be trading slaps"
Singer is reported to have missed a flight from London to Athens
Singer also criticised meat eaters at O2 Arena gig
Singer began encore in Essen before being escorted to safety by security