From the Radio Times website:
Who Do You Think You Are? Monday 19 July
9:00pm - 10:00pm
Nine celebrities trace their family trees to reveal the lives of their ancestors and explore major themes in British social history. When Bruce Forsyth receives a letter from America from a woman who claims to be related to Bruce through his great-grandfather, suggesting he was married to two women at the same time, Bruce becomes determined to investigate these claims and discover the truth for himself, a quest which takes him from Bond Street to New York.
VIDEO Plus+: 4797
Subtitled, Widescreen, High definition, Audio-described
Directed by: Leo Burley
Additonal programmes will include Dervla Kirwin, Rupert Penry-Jones, Monty Don, Jason Donovan, Rupert Everett, Hugh Quarshie and Alan Cumming, and Alexander Armstrong.
I think I'm right in saying this is the first series to be made in HD, but am open to correction!
Professional genealogical problem solving and research
Researching Scottish Family History (New book)