OK - its my first entry , but I have to pass this tip on. If you are a fan of center parks try the european site. The hols are much cheaper and the standard and quality are better than the 'rip off britain' parks.
OK - you have to add the cost of a ferry , but think of all the cheap wine etc.. you can bring back!
(we recently went on our 3rd trip to Erperheide in Belgium this year for £320 midweek break in a VIP cottage at 'peak' whit hols)
If the link does not work - try http://www.centerparcs.com