It's not as though there's a great deal of choice at some of these places.
Alton Towers - middle of nowhere
Whipsnade Zoo - middle of nowhere although if you go down the hill a bit there's a NT carpark on Bison Hill
Thorpe Park - MoN
Chessington, Legoland etc.
When they're charging £20/£50 a ticket to get in, I feel a bit ripped off having to pay for parking at £4/£5 a time as well. AIBU?