"If You Were The Only Girl In The World" is the seventh episode of the fourth series of the period drama Upstairs, Downstairs.
The tea party that was arranged by Hazel and Lady Prudence in Home Fires takes place in the Morning Room of 165, Eaton Place, and only three officers are there, along with Lady Berkhamstead and Mrs Vowles.
Hazel befriends Jack Dyson, a shy, young airman who like her has risen from the lower middle class.
The day before he returns to the Front, Dyson goes to Eaton Place to say goodbye, but Hazel is at the canteen.
Meanwhile, Georgina is now a nurse in France, along with her friend Angela Barclay and Jenny.