[2] In 1853 it became an ecclesiastical parish, and the church of All Saints and St Hilda was built in the Victorian gothic style by the architect Sir George Gilbert Scott.

Bristol Siddeley Engines then operated the site together with a factory at Stag Lane Edgware and a test facility at the old Hatfield site until 1968 when Bristol Siddeley Engines (by then a very profitable company) was forced to merge with Rolls-Royce by government pressure.

Flying ceased at the end of March 1994. Notable achievements by the engineering team were the world's first full authority electronically controlled helicopter engine and initial development of the first pedestal cooled turbine blade, now common throughout the industry.

[5] Property development company MEPC plc is redeveloping the former aerodrome site, including the studio complex and adjoining land known as Leavesden Park.

The plans comprise a film studio, a media and telecommunications business park, and retail outlets, and a nature reserve.

[8] To the north, Leavesden Country Park comprising 110 acres of mature woods, parkland, football pitches, BMX track, outdoor gym, walks and playgrounds was created out of the grounds of Leavesden Hospital which closed in 1997.

Also, what was based on the old airfield site, now accessed along High Road, Leavesden sits 2F (Watford) Squadron of the Air Training Corps.

Leavesden is close to the M1 and M25 motorways, the A405 (London Orbital Road) and the A41 (North Western Avenue).