I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
A very large park with a very historic grade I listed 16th century manor house and gardens. Also includes a folly just up the hill.
As this is National Trust land I'd recommend TOALing from one of the nearby field areas in order to avoid confrontation. I TOALed from a remote grassy corner next to a gate just off the west side road leading to the car park.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 11/06/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.