Ha ing made an error with my return booking I was disappointed that the overstay charge was £20. As a fairly regular user I feel that this is a high price to pay for me misunderstanding my arrival back into the uk. The staff were helpful but there was no discretion about my dilemma when I mistakenly booked my departure from the car park on the day of my return flight on Friday 28th April instead of Saturday 29th as the flight landed at 1.00am. I believed that booking my departure at 2.00am covered this but realised that I should have booked it for 2.00am on Saturday.