Try feather down farms. It is as friendly as you want it to be and there are lots of primary age children. The one we went to in Devon had an honesty shop and the DCs loved going to get milk on their own and writing it down on our chart. Also they do 4 day breaks in the summer holidays.
I really want to take DD away this year, we didn't have a holiday last year due to finances. I haven't got a great deal to spend this year so happy to go for 4 nights Monday to Friday.
I've been looking at Center Parcs and Bluestone and they are way out of my league But I wanted to go somewhere where everything is provided (don't mind self catering) and where we can mix with other people.
I have transport so can travel and I live in North Wales.