1 - John Simm and Phil Glenister

Actors John Simm and Philip Glenister don't expect some news that a DNA test reveals about John's dad while delving into their family histories.

2 - Ricky Tomlinson and Sue Johnston

The Royle Family stars Ricky Tomlinson and Sue Johnston use DNA and genealogy to reconnect with lost cousins and unearth long-held family secrets.

3 - James Nesbitt and Sarah Parish

Actors James Nesbitt and Sarah Parish learn about an educator who fought for working-class children to get an education and a First World War hero.

4 - Fay Ripley and Hermione Norris

5 - Julian Clary and Jo Brand

6 - Sam Thompson and Marvin Humes