Play of the Month
On Approval

21 June 1982, BBC
13 March 1983, Masterpiece Theatre, PBS
Role: George, Duke of Bristol 

Video clip on YouTube 

On Approval is a witty and charming drawing room comedy set in 1927. Four stylish, unmarried people spend a month together, "on approval," to decide if marriage would be the bliss they imagine. It is based on a play by Frederick Lonsdale. --  Masterpiece Theatre

The following is from a fan's page about the teleplay
which also has information about acquiring it

On Approval is set in 1927 and concerns Maria Wislack, a spoiled, rich widow considering marriage to a kindly gentleman named Richard Halton, who has been secretly in love with her for 18 years. Cynical about love and extremely domineering, she decides to take him away to her estate in Scotland for a month "on approval." If he measures up to her expectations (platonically) she will marry him. If not she'll give him railway fare back to London. The idea of a lady suggesting such an experiment was considered risque enough in 1927 to be intriguing. 

The title is a side reference to the custom at the time of being able to take an appliance home for one month "on approval" to test it. At the end of that time, you could purchase it or return it if it didn't live up to  expectations.

Also in the picture is the spoiled and recently impoverished George, Duke of Bristol, whose self conceit is equaled only by Maria's. He is loved by the young and wealthy Helen Hale, whom he likes and sees as a possible way out of his financial problems.

All four end up trapped in Maria's Scottish estate after her servants abandon her. The comedy derives from their discovering the reality about each of their true natures. 

This is a quiet gem of a comedy that steals into your heart and never leaves. This is a play where Lonsdale's brilliant dialog, delivered by four great actors whose timing and delivery is perfect, flows over the watcher in a rich wash of sly comments.

IMDb page