 The men had been responsible for a wave of bombings in London, but had been intercepted by armed police while attacking a restaurant.Imbert was the chief negotiator over the six days of the Balcombe Street Siege, and when the situation ended peacefully with no lives lost and the four IRA members under arrest, Imbert was noted as a possible high-flyer in the police force.Peter Imbert played a major role in interrogating the Guildford Four and in capturing the real IRA bombers.