Consider similar "bungalow parks" in Belgium and/or Holland. We have visited at Easter in the past and they have been the same price as the British Centre Parcs but INCLUDING the price of the ferry. There is Sunparks in Belgium and Landal Parks in Holland. Our favourite park was Vielsalm in the beautiful Ardennes. Food is wonderful in Belgium, eat out in the local town rather than at the parks where, like here, it is fast food rather than quality food. Another high quality park was one of the Landal Parks Landal T'Loo about an hour from Amsterdam. Super quality. You can usually get in over the school holiday periods because there are lots of bungalow parks in Europe.