NOTES: F.R.S. Yorke was the consulting architect for this factory-made steel-clad house commissioned by the Ministry of Works. The house derived its name from Baron Portal, of Laverstoke in the County of Southampton (later Viscount Portal), who served as Minister of Works during World War II.
NOTES: Thirteen part-prefabricated houses were built for the Ministry of Works at Northolt to show alternative types of materials, plans and construction. The steel frame and cladding were designed by Frederick Gibberd and built by the British Iron and Steel Federation.
NOTES: Construction on this low-cost housing estate began in 1946 and on its completion in 1962, fifty-seven blocks had been erected on the 64 acre site that had previously been dairy farmland.