Turner's memoirs are released in March
Turner said his public school background counted against him
Turner will headline Festival Republic Stage in one-off solo show
Singer-songwriter appeared at Death Or Glory Records in Worcestershire on Saturday
Singer and his band will play Royal Albert Hall gig on March 29
The singer-songwriter performed Jamie T and Billy Bragg songs at the squatted venue in Soho
Soho venue is currently occupied by squatters calling themselves 'Bohemians 4 Soho'
'Merry Christmas You C***s' is a cover of a track by The Breakdowns
Turner updates fans from the studio, where he and his band are recording with producer Butch Walker