London-area resort recommended

We are 3 couples with 2-3 kids each (age range 6-12) and are traveling to London for a vacation.

During our stay there, we want to try some country resort that has a lot of family friendly activities as the kids are full of energy and need stimulation!

Ideally, the resort would be within a 2 hour drive / train ride of Central London.

We are looking for something a bit on the luxurious side, definitely not a resort that is tired or has seen better days in the past.

Would appreciate any recommendations. Budget for the room is up to $2k per family per night. We are not looking for big, lavish suites or anything, even a nice double room with roll-in beds is fine (but not something in need of a reno); we’re more interested in a beautiful place where the kids can make happy memories.