Two men lean over a bass guitar on stage at The Brudenell Social Club, one holding a flashlight as the other tries to work out what exactly has gone wrong. Until moments ago, post-punk trio Bilge Pump were happily playing to a sold-out crowd. The mood one of celebration, a well-deserved victory lap for some longstanding local legends. So, naturally, the band’s bass guitar had to stop working mid-set. The night can’t end like this. Can it?