two pairs of tickets to be won.
alt-j on a rooftop at the disaronno terrace, platform, netil house,east london.
"for you chance to win tickets to this one-off rooftop party, follow :Metro_Showbiz on twitter and tweet us using the hashtag #MetroDisaronno by 18.00 hours today."
winners must be 18 or over.
for details visit http://www.facebook.com/Disaronno