 Complete the following phrase:  James Francis Nevill 20 February 1927  12 December 2007 was the head of the Scotland Yard Bomb Squad. He was Detective Chief Superintendent in 1975 at the height of a Provisional Irish Republican Army bombing campaign in London, the police cornered four IRA gunmen in a flat in Balcombe Street where they took a middle aged couple hostage. The siege lasted for six days, Nevill was in charge of the negotiations. He also took part in the investigation of the 