The Trou­ba­dour at Earls Court. Upstairs is the quirky cof­fee house and restau­rant which I don’t think has changed in appear­ance since I first vis­it­ed it in the 70s. Down­stairs is a venue at the heart of Lon­don’s music scene, a cramped cel­lar which has seen the likes of Bob Dylan grace its stage. Last night…