Bequest to the Nation (1973)
Wikipedia: Bequest to the Nation is a 1973 British historical drama film directed by James Cellan Jones and starring Glenda Jackson, Peter Finch, Michael Jayston and Margaret Leighton. It is based on the 1970 Terence Rattigan play A Bequest to the Nation. The film depicts the relationship between Admiral Lord Nelson and Lady Hamilton during the Napoleonic Wars plus others they would meet, including Nelson's nephew: the story takes place before Nelson's heading out to sea for the battle of Trafalgar. In the United States, it was released as The Nelson Affair.