Northolt is one of the remoter and greener suburbs, served by the central (LUL) line and BR.
If anything, it is known for its airport, ostensibly RAF but with a large percentage of diplomatic VIP traffic. The airport was one of the original London airports (along with Heston, the forerunner of Heathrow). It was used at the time of the British Olympics and still features to this day airship hangers as a reminder of past use.
The airport now houses those relocated from RAF Uxbridge, to make way for the amalgamation of various US contigencies. The airport is situated alongside the A40, and the sad relic of a gate guardian in the form of a neglected Spitfire is clearly visible from the road.
Northolt is characterised by extremes. At one time, Northolt boasted the nearest racetrack to London (Northolt Park), and a large percentage of the original track now surrounds a nondescript council estate - famed for being beset with racially motivated gang violence. The original iron gates and entrance to the racetrack have been retained (visible from Mandeville Road) and all the roads on the council estate are named after racetracks (Thirsk Road, Kempton Avenue, Epsom Close, Ascot Close, etc, etc).
Northolt is also characterised by the sight of three huge artificial hills as you approach it on the A40 leaving London. The local council (London Borough of Ealing for some odd reason) claimed they were restoring unused playing fields into a nature sanctuary, but in reality these enormous mounds have really been just a dumping ground for the demolished remains of the old Wembley Stadium. A quick covering of soil and grass seed and voila, the council have made themselves a mint and collected an EEC restoration grant. Great when the toxins start leaching through, an inheritance for all in the region to share.