Bright-Ling,
I wouldn't describe Biggin as easy to get to. I know things have changed in the last couple of years but as far as I know the nearest stations are either Bromley South or Orpington and then a 20 minute bus ride. It used to be the 410 from Bromley would go every hour and at rush hour if they were full, they would sail past the Bromley South Bus stop. The regulars would get off the train and walk in the opposite direction to Biggin in the hope of getting the 410 before it filled up.
Redhill has a good train service, still a taxi ride from the station but fast regular trains. Elstree is quite good, again a taxi ride away from the station.