For anyone driving into London from Oxfordshire, Birmingham or other routes that lead to the M40, a handy place to ditch your car is Perivale. Pull off at the Hoover Building (marked "Perivale/Ealing"), and you'll find a largish pay-and-display car park directly behind Perivale tube - £3 all day flat fee, 24-hour access. If even 3 quid is too much, you can risk parking on Tesco's car park down the road - they are so dozy that they never check it. As well as the tube, the N11 night bus runs all through the night from Trafalgar Square, directly to the car park - as I discovered when I met up with Time-Is-Now after SATYAGRAHA a fortnight ago
Reiner
I took your advice last Thursday when trying to get to the Barbican from Oxford.
It worked a treat, far less hassle with the traffic, especially when trying to get out of London again.
David