"Magic Casements" was among the episodes omitted from Upstairs, Downstairs' initial Masterpiece Theatre broadcast in 1974, and was consequently not shown on US television until 1989.
In spite of Lady Marjorie's attempts to hide it - she burns the note that comes with the bouquet of roses that Charles has sent her - the servants get wind of it and then discover a boxful of love letters.
Richard begins to piece together what has happened but rather than losing his temper with his wife, he tells her that he has changed his political stance, as it is a question of loyalty.
Marjorie realises that she must also be loyal, so she sends a note to Charles, asking her to meet him at the opera; there, she ends the affair, bidding him a tearful farewell.
The episode's title is taken from Keats' 1820 poem Ode to a Nightingale, verse 7:[2]Charm'd magic casements, opening on the foam Of perilous seas, in faery lands forlorn.