Television presenter Fiona Phillips makes a very personal journey to Wales to trace her family tree where she learns of her ancestors' role in one of Wales's most famous historic events and the very moving story of her family during the First World War.

Spooks and Hustle actor Robert Glenister makes an emotional journey to Wales to trace his family tree, where he learns of an extraordinary story of courage and heroism that would see his ancestor travel to the other side of the world to do his duty for king and country.