I never thought I’d find myself defending one of those supreme irritations of modern life – pianos at train stations. Normally the last thing I want to hear when rushing for a train is a clunking approximation of Hallelujah or Let It Be. However, a video is doing the rounds of Brendan Kavanagh, a pianist who live-streams his boogie-woogie performances, being confronted by a group of people wielding the flags of Communist China and seemingly linked to Chinese state television, for filming a video