Have used Airparks many times at Gatwick with no problems- Stansted however was a different experience !! Departure was no problem but on arrival back at Stanstead we waited 20mins for bus and then tried to find our way to the exit from the car park . It was very poorly signposted and we seemed to be doing a complete circuit of the area - then when we put our airparks card in the machine it told us we owed £80 -we had only been away 3nts and had already paid - I used the help button and it was sorted out quite quickly but I don't feel inclined to try Stanstead again