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From the Wikipedia page [1]

Ruislip-Northwood was an urban district in west Middlesex, from 1904 to 1965. From its inception Ruislip-Northwood fell within the Metropolitan Police District and from 1933 it was part of the London Passenger Transport Area.

Now part of the London Borough of Hillingdon

A film showing parts of the UDC here.

Some further information here.

See also[]

List of Chairmen of Ruislip-Northwood Urban District Council