I have flew from Gatwick and Manchester with Qatar to Cebu, the parking charges in London are a lot higher that Manchester. Off the top of my head two weeks parking at Gatwick was a £100 and Manchester was apron £60. I am flying out for 1 month in April and York to Manchester is not far at all so it was a no brainer for me. Plus I drive an XKR and the best I can get on a long trip is 23mpg.