Duncombe Park, Yorks.

The house, flanked by two large square service wings, is set in extensive parkland. The house was completed in 1713 and remodelled in 1843. The central block was gutted by fire in 1879 and not rebuilt till 1895, with a slightly revised layout.
I visited Duncombe Park in 2005. Inside, there is the Stone Hall, a lavishly decorated forty-foot cube, and other fine rooms with period furnishings. The house is no longer open to the public, but you can still visit the park and gardens, which are open several days a week during the warmer months.
(If you are curious to see what the house is like inside, check Weddings/Ceremony Locations on the Park website, or enquire about the Special Events.)
The gardens are quite extensive and include two temples, a large formal terrace, and a ruined conservatory.