Hi. Been advised by a friend to drive finchley train station and park there and get the tube to London for the day. Only about 70 mins from me and be cheaper than paying on train for 4 people. Also not committed to train coming back. She is not 100 percent sure if the congestion charge falls underneath there as her car is exempt. Mine is old. Can't seem to find it on Google. Does anyone know please? Thanks in advance. She said cheap to park too.