The London Transport bus overhaul works were developed in 1956 on a 67 acre site at Aldenham, Hertfordshire, originally intended for car sheds for the proposed Northern Line Bushey Heath extension, and used in the Second World War for aircraft production. London Transport's Bus Works Restructuring Programme, 1983-4, was followed in October 1985 by the decision to discontinue the practice of completely overhauling each bus every four or five years. As a result, it was decided to close the Aldenham Works, transferring its activities to the older and and smaller maintenance depot at Chiswick, and selling the Aldenham site for redevelopment.
Reference: G.J. Child, 'Aldenham Bus Works', Journal of the Watford and District Industrial History Society, no.15, pp.15-17. 1989.