Upstairs, Downstairs (1971)

S1E7 Magic Casements

In the summer of 1906, Captain Hammond, a dashing young companion of James, kindly offers to take Lady Marjorie to the opera. As they spend time together, they discover a deep mutual attraction and a striking compatibility, despite their age gap. Meanwhile, the household staff buzzes with gossip, seemingly the only ones clued into the budding romance unfolding between the two.