I see Matt's work around Leeds quite a bit, and I'm not sure his work is screenprinted (or at least not all his work). My guess would be this is a poster made to promote the gig, not made as merch.
This raises an issue that needs addressing really. I don't understand why it's assumed that UK poster artists have to go 'through' the Goodall Gallery. Don't get me wrong I like them and am appreciative of their endeavours in drawing attention to the medium, but it makes far more sense for artists to be dealing directly with the bands and venues. Just my opinion!