The seat returned each of three Conservatives who stood in turn. Its narrowest majority was 17.3% in 1997, over the Labour Party candidate.
History
This represented the northern half of the earlier Uxbridge constituency which was divided into two following house-building in the area in 1950.
Ruislip-Northwood was a constituency that as such covered slightly elevated and gently hilly outskirts of West London, beginning 12 miles (19 km) WNW of Charing Cross.[1]
All three of its successive Members of Parliament were Old Etonians and as the majorities they received were non-marginal, with their contributions the seat was throughout its elections a safe seat.
1950–1974: The Urban District of Ruislip-Northwood.
1974–1983: The London Borough of Hillingdon wards of Eastcote, Haydon, Manor, Northwood, Ruislip, and South Ruislip.
1983–1997: The London Borough of Hillingdon wards of Bourne, Cavendish, Deansfield, Eastcote, Manor, Northwood, Northwood Hills, Ruislip, and St Martins.
1997–2010: The London Borough of Hillingdon wards of Bourne, Cavendish, Deansfield, Eastcote, Harefield, Manor, Northwood, Northwood Hills, Ruislip, and St Martins.