Coming into effect on 6 July, the 1957 Act immediately decontrolled all dwelling houses and all contracts for furnished lettings of dwelling houses, with rateable values on 7 November 1956 exceeding £40 in the Metropolitan Police District or the City of London and Scotland, and £30 elsewhere in England and Wales; and tenancies granted for a period exceeding 21 years.
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The area of London (extending outwards to the then boundary of the Metropolitan Police District and thus including some areas outside the modern Greater London) was designated Region 5 and had its Regional Seat of Government in a re-used radar station at Kelvedon Hatch in Essex.