Center Parcs type water parks

I want to go on a family holiday in Europe with one of those tropical water places and things for the kids to do. Been to one in Holland a few years back but the accomodation was very basic. Can anyone recommend a good place in Northern Europe?
I have been to the UK ones and we went to a Dutch one last year and I have to say that they seem to be living off of their reputation now and become too expensive for what they offer, the Dutch one was particularly disappointing and the UK ones are pricing themselves out of the market.

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