Lots of suggestions thanks.
A few people at work own statics, they seem popoular down here - I think they mostly go to Clacton and surrounding areas
Centre Parcs - we been there before and we liked it. We even took my disabled Mum. We went for a bike ride with her in her disability scooter through the woods. Somehow she managed to tip it and she got snagged between the scooter and a tree stump, my wife and I nearly cacked ourselves when we saw her topple but afterwards we could see the funny side....my mum the stunt driver...only my mum could stack a disabled scooter! Anyway, centre parcs is an option.
Somewhere near the in-laws isn't a terrible idea. Don't get me wrong, my in-laws are great, very kind to me and have helped no-ends with my mum but I do find it hard to really relax around them...more my issue than theirs.
As posted above, I'd like somewhere hot but not too hot. But I think I'm also being unrealistic, maybe something more simple is more achievable?