Dead easy to find. 1 minute off the A40. Bit of a dingy space inside and not totally clear what is public and what isnt. Plenty of spaces though and felt safe. 5 mins to walk along a path to the station.

At the entrance the pay machine accept card else you need coins or pay by phone Pay by phone over charged me from 1 Flat rate 10£ a night to 12£ for 3 hours After paying I found a pay machine that accept card at entrance

It's great if you're travelling from Paddington however the car park is off the last platform of the station. It is dark and spaces are tight in certain areas. From the car park to the actual main quad it took me about ten minutes.

Found it by accident, nice site with very friendly and helpful staff, Please note this site is not in the congestion charge zone, but if you take the wrong turn on exiting the site you could easily end up in it...