Band are working on follow-up to 2014 LP 'Songs Of Innocence'
U2 frontman was dining in a restaurant in the French city when Bastille Day attack took place
Guitarist becomes first rock artist to ever perform at religious landmark
'I relied too much on alcohol to get me through things' - Clayton
Irish four-piece also hint they may tour sooner rather than later
The U2 frontman pays tribute to the late musician
Ukelele owned by Madonna also sold for £208,000 at Haitian Relief Organization event
U2 frontman offers fans the chance to ride a tandem bike around New York's Central Park
Progress is being made on the companion to 'Songs of Innocence'
The annual Christmas tradition goes big in 2015