Hey I am going to Brands from London for the WTCC weekend, the direction go as far to the Swanley Station, which is still around 8km away from the circuit itself, I don't drive so anyone knows is there any connection to brands from nearby locations?
You might want to take a look at this website. Do a search for "public transport" and you'll come across 2 articles titled "Fan's View - Contributed by "Matt H - Radermecker's biggest fan!"" and "Fan's View: Getting there by public transport". The second is probably more useful.