How about public transport?

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Just 2.5 miles from GreenPark, Reading’s main line railway station serves two London termini - Paddington and Waterloo - as well as Birmingham, Bristol, Hereford, Gatwick Airport and longer distance destinations.
The Heathrow Express departs from Paddington every 20 minutes. There are regular stopping services to and from all local commuter stations, too.
A dedicated bus service runs every 7-8 minutes direct from Reading station and town centre, stopping at several points around GreenPark. There is also a plentiful supply of taxis from Reading station, including some in GreenPark’s own distinct livery.
In July 2006, the Department for Transport confirmed its final approval for Reading GreenPark Station. The station, on the Reading-Basingstoke line, should be open by December 2008 with trains running every 30 minutes with frequency increasing with demand. The trains will initially run to Reading Central Station but will eventually continue directly on to London Paddington.
A map showing GreenPark's bus stops (fact file)