allow staff from the MAP into the Supermarine factories without the proper credentials. Pratt, overworked and suffering from depression, committed suicide soon afterwards. During 26 September air raid at least one bomb had passed through the drawing office, out of the window and into the mud on the river bank below; another went straight through the floor without exploding. As a result, the majority of the design material and drawings survived. The design team were quickly moved to temporary accommodation in old World War I army huts, being used by the University College in Highfield. One of the huts was then destroyed by an incendiary bomb prompting a further move beginning 7 December 1940 when all of the company's design, production and administration was moved to a new permanent home at Hursley House. Located close to Winchester, this large stately house was requisitioned by the Ministry of Aircraft Production from the Dowager Lady Mary Cooper, who remained in residence until June 1942. It was decided that new dispersed facilities should stay within 50 miles of Southampton so that control and communication could be maintained. By mid November 1940, 35 workshops were up and running. Eventually there were 250 sub-contractors supplying 60 workshops in Hampshire, Wiltshire and Berkshire, clustered around four production centres: Reading (with assembly at Aldermaston and Henley), Salisbury (with assembly at Chattis Hill and High Post), Southampton (with assembly at Eastleigh) and Trowbridge (with assembly at Keevil). An additional area around Winchester and Chandler's Ford was linked to the main design base at Hursley Park. Each production centre had workshops able to make each part of the plane and an airfield at which final assembly and delivery could be performed. The smallest assembly centre was High Post where the assembly hangar was so small that only three Spitfires could be assembled at a time. Production was six a week. Castle Bromwich concentrated on the standard models of Spitfires, including the Mk II, V, IX and XIV, as it was time-consuming to change its mass assembly production lines from one model to another. In contrast the dispersed production and small output from each individual production centre surrounding Southampton had the advantage of allowing flexibility and responsiveness without major disruption to the overall production. Each production centre tended to specialise on a particular model of Spitfire and so could much more quickly provide smaller numbers of specialised aircraft in response