Britain’s top counter-terrorism policeman has resigned after his security leak forced a major anti-terror operation to be brought forward.Bob Quick had been photographed at Downing Street, openly carrying a secret document revealing plans to crack down on a suspected al Qaeda plot. Hours later, police arrested a dozen men in unusual daylight counter-terrorism raids across northwest England including Manchester and Liverpool. Amid suspicions a group was planning fresh attacks on the UK, four years after the London suicide bombings, the twelve are still being questioned. Most are Pakistani nationals. While the police operation is being seen as a success, the fact that it had to be rushed forward because of the blunder caused an outcry. Stepping down as Scotland Yard’s Assistant Commissioner, Bob Quick admitted his actions “could have compromised a major counter-terrorism operation.” No stranger to controversy, Quick had been criticised last year for ordering the arrest of a senior Conservative member of parliament – over alleged security leaks.