Robert Plant, SBTRKT and The Black Keys also performed at French festival
The band are currently working on follow up to 2013 album 'Opposites'
'Its gone from being just gross to actually kinda dangerous,' says frontman Simon Neil
Singer Simon Neil promises the band will try 'make it the very best thing we've ever done'
Band have begun demoing new songs ahead of 'Opposites' follow-up
The trio hope to release their seventh album in 2015
The band also performed one unreleased track in last Scottish date before T In The Park headline slot
The sessions will take place as part of the forthcoming BBC Radio 1 Big Weekend in Glasgow
The winner of the £20,000 prize will be revealed at a ceremony on June 19
The show will also raise awareness for War Child