drive to uxbridge/hillingdon (off m40) tehres aloads of streets about where you can park. theres also a coach which goes from hillingdon station into central london, costs bout a fiver return. one is the x90 which drops off at baker st, marble arch, and victoria station. and the other is the oxford tube which drops off in shepperds bush, marble arch and victoria station. or you could just get the metropolitan or the picadilly line into london. i would stay off the metropolitan as its always got signal failure.