I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Gunby Hall is a country house in Gunby, near Spilsby, in Lincolnshire, England, reached by a half mile long private drive. The Estate comprises the 42-room Gunby Hall, In 1944 the trustees of the Gunby Hall Estate, Lady Montgomery-Massingberd, Major Norman Leith-Hay-Clarke and Field Marshal Sir Archibald Montgomery-Massingberd, gave the house to the National Trust together with its contents and some 1,500 acres of land.
Minor roads around estate to take off and land that don,t belong to National Trust
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 26/01/2022. It remains the responsibility of any pilot to check for any changes before flying at the same location.