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Fiercely proud of his Celtic origins, actor David Tennant's research into his maternal grandfather's family uncovers the reason that his great-great-grandfather was forced to leave the Isle of Mull for industrial Glasgow. Journeying on to Londonderry to investigate the lives of his Scottish grandfather. Derry City footballer Archie McLeod , and his Irish wife Nellie Blair , David embarks on a difficult journey into the sectarian side to his family roots. Director Donna Sharpe ; Series producer Lucy Carter

Repeated next Tuesday on BBC2