Sarah Lancashire, Anne Reid, Derek Jacobi and Nicola Walker in Last Tango in Halifax

Dramas about star-crossed lovers often feature bright young sexy things, so it’s refreshing to see a love story between two grown-ups on screen.

Derek Jacobi and Anne Reid play teenage sweethearts Alan and Celia who grew apart but are reunited by their grandchildren and the miracles of social media.

But their respective daughters Gillian and Caroline (Spooks’ Nicola Walker and Sarah Lancashire) aren’t so keen on their parents shacking up…

Last Tango in Halifax is on BBC1 tonight, Tuesday 20 November, at 9pm.