On one occasion – in the wake of yet another raid on "IT" – London's alternative press succeeded in pulling off what was billed as a 'reprisal attack' on the police. The paper "Black Dwarf" published a detailed floor-by-floor 'Guide to Scotland Yard', complete with diagrams, descriptions of locks on particular doors, and snippets of overheard conversation. The anonymous author, or 'blue dwarf', as he styled himself, claimed to have perused archive files, and even to have sampled one or two brands of scotch in the Commissioner's office. The London "Evening Standard" headlined the incident as "Raid on the Yard". A day or two later "The Daily Telegraph" announced that the prank had resulted in all security passes to the police headquarters having to be withdrawn and then re-issued.