We recently stayed at Beavers retreat on Lower Mill Estate, we were looking for somewhere not too far away where we could relax an let our 5 year old run around safely.
The house is very well appointed with quality bathrooms, linens and towels. There is plenty of space to sleep and eat for 10 people though the living area would struggle to sit 10 comfortably, not a problem for the 3 of us.
Lower Mill Estate is a lovely nature reserve and the views from this property were excellent as you did not have properties on the other side of the lake to spoil the view.
We were incredibly lucky with the weather and so took full use of the estate. We took our own bikes (recommended) and toured the country side which is all level so no trouble for young children. The development also has a spa, swimming pools and tennis courts all of which are in first class condition. Lower Mill was not busy during our stay but I can imagine during peek weeks it could be quite busy...