May be a long shot but we found out about Tuckenhay on here so maybe we can benefit again.
It was a perfect set up for us with 11 & 13 yo's. Particularly the tennis, outdoor pool and esp the indoor waterfall pool. I liked the peacefulness and privacy and how everything was steps away.
Is there anywhere else similar in the UK. I have found loads of cottages with pools but none that come close to the waterfall one and we are not after a bigger holiday park with water park as done that before. We liked having pool slot booked to ourselves then we didn't need to worry about disturbing anyone else with jumping, splashing etc.
Would happily go back to Tuckenhay but also fancy visiting elsewhere if there is a similar set up.