Ok guys so this has taken me a while but I have complied a map of travel time to English theme parks and you can see the results above.
Lets break down the best places to live by number of parks accessible in 1:30 then-
WEST LONDON- within 1:30 of Paultons (1:14), Chessington (0:35), Thorpe (0:24), Legoland (0:25) and Adventure Island (1:30)
OXFORD- within 1:30 of Paultons (1:12), Chessington (1:14), Thorpe (1:01), Legoland (0:59) and Drayton (1:25)
HOMFIRTH (HUDDERSFIELD)- within 1:30 of Blackpool (1:29), Alton (1:30), Lightwater (1:20) and Flamingo (1:29)