Among the new tracks was this untitled number, which you can stream a recorded clip of below.
The tickets to the gigs were priced £19.50, but the winners were decided via a lottery. The Mercury Prize-winning band played Electrowerkz in Islington on Monday and play Battersea Arts Centre on 18 May.
Catch that new track beneath:
UPDATE: Another video has surfaced of some new XX material, watch below: