DVDs at Amazon:
The Madness of King George (1994 Movie)
Date set: 1788
3.55 / 5 (from 7 ratings)
Directed by: Nicholas Hytner
Writer(s): Alan Bennett
Arundel Castle, Arundel, West Sussex, U.K. (exterior of Windsor Castle)
Bodleian Library, Broad Street, Oxford, Oxfordshire, U.K.
Broughton Castle, Banbury, Oxfordshire, U.K. (Queen Charlotte's apartments)
Eton College, Eton, Berkshire, U.K. (Houses of Parliament)
Old Royal Naval College, Greenwich, London, U.K.
Shepperton Studios, Shepperton, Surrey, U.K.
St. Paul's Cathedral, Ludgate Hill, London, U.K.
Syon House, Syon Park, Brentford, Middlesex, U.K. (where King George meets Pitt)
Thame Park, Thame, Oxfordshire, U.K.
Wilton House, Wilton, Salisbury, Wiltshire, U.K. (interior of Windsor Castle)
IMDb link: The Madness of King George (1994)