I went to thorpe park yesterday, and there was a warning saying that if you we're above 6'4" then you many not be able to go on all the rides. However, there was only one ride with a specific height restriction (of 6'4") that i saw. None of the major rides had a specific height restriction, but you must be able to fit in the seat, and unfortunately you wont be able to check that until you are there. I assume there wont be many differences between the restrictions, but i cant say for sure.
Hope this helps,
Mike