Celia and Alan are both widowed and in their seventies. When their respective grandsons put their details on Facebook, they re-discover a passionate relationship that started over sixty years ago.

Celia’s daughter Caroline, played by the wonderful Sarah Lancashire, is a headmistress of a successful school. From the outside, Caroline looks like she breezes through life. But her marriage has failed, her sons are hormonal and her love life is complicated…While the brilliant Dean Andrews plays love-lorn Robbie, yearning after on-off love Gillian.

Make sure you catch this final emotional episode on Christmas Eve on BBC1 at 9pm.