Originally Posted by
Raffles
Use a local mini-cab firm, it will be cheaper.
Alternatively, the Heathrow hotels are generally about £40 at the moment (eg HI Aerial) so taking the train the night before and stopping over might be less stressful.
Add 8 quid for the Hotel Hoppa, or less if you can get creative with the local buses. (An example coming form Central London would be the Piccadilly Line to Hounslow West, then the 222 to Uxbridge, which would pass the Premier Inn, Sheraton Skyline, Holiday Inn M4J4, and a few others I can't remember).