Bobby Vylan of Bob Vylan performing on Glastonbury's West Holts Stage last monthPunk rap duo Bob Vylan put on a surprise show in London on Wednesday that marked their first live performance since their polarising Glastonbury set.Last month, the group’s frontman Bobby Vylan generated controversy when he was heard leading the crowd at Glastonbury in a chat of “death to the IDF”, referring to the Israeli army, which was broadcast live on the BBC’s iPlayer service.It was later reported that the performance had sparked a criminal investigation, to which the