Group of between 6 and 8. Based west midlands, would travel a couple of hours, I think. Budget prob mid range, think £150 max for weekend I guess.
We're a mixed bag - some will put dressing gowns on as they arrive and stay in them till it's time to leave, some will want to spa a bit, then have a mooch, some v outdoorsy. Suitable hitel would be fine but Self catering might be ideal though spa facilities hard to come by in those cases. Not Center parcs - we are AVOIDING kids that weekend. 
Any recommendations gratefully received.