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In page Supermarine:

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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.[4] Eventually there were 250 sub-contractors supplying 60[5] 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).[6] An additional area around Winchester and Chandler's Ford was linked to the main design base at Hursley Park.[citation needed]