Band are preparing their second album 'Wild World' for release
London five-piece to perform at special event encouraging young people to participate in the upcoming vote
Trailer features first new album song for four years
"I hope you like it. It's a bit weird," says frontman Dan Smith before the band plays their new song
The band posted a two-minute teaser video on Facebook
Band say they've written 25 songs for their second album
Second album is also said to be coming 'soon'
Band made unannounced appearance on William's Green Stage
Band take to twitter to suggest a secret festival set on Friday June 26
Big acts lined up for charity's <em>Passport Back To The Bars</em> gigs