Castles & palaces
Hilfield Castle
English country estate
Wikipedia names Hilfield Castle as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Hilfield Castle. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landmarks & buildings
Aldenham School
England · 1 km north-east
Independent day and boarding school in Elstree, Hertfordshire, England
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Castles & palaces Bhaktivedanta Manor
England · 1 km north
Hindu temple, formerly a country house, in Hertfordshire, England, UK
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Landmarks & buildings Immanuel College
England · 1 km south
School in Bushey, England
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Towns & cities
Letchmore Heath
England · 1 km north
Village in Hertfordshire, England, UK
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Castles & palaces
Aldenham House
England · 2 km east
Country house in Aldenham, Hertfordshire, England, UK
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Landscapes & nature
Aldenham Country Park
United Kingdom · 2 km south-east
Park in United Kingdom