<Dd> For the U.S. series of the same name, see Who Do You Think You Are? (U.S. TV series). </Dd> <P> Who Do You Think You Are? is a British genealogy documentary series that has aired on the BBC since 2004 . In each episode, a celebrity traces their family tree . It is made by the production company Wall to Wall . The show has regularly attracted an audience of more than 6 million viewers . More than ten international adaptations of the show have been produced . </P> <P> Series one and two were broadcast on BBC Two, and the first was the channel's highest - rating programme of 2004 . This led to episodes being shown on BBC One from the third series onwards . The current narrator, as of Series 14 in 2017, is Phil Davis . Mark Strong took over from David Morrissey after the first series, which was nominated for "Best Factual Series or Strand" in the 2005 BAFTAs; Cherie Lunghi was the narrator between Series 10 and 13 . </P> <P> In the first series, the last ten minutes of each episode featured presenter Adrian Chiles and genealogical researcher Nick Barratt giving tips on tracing a family tree . In 2007, a special episode was broadcast in conjunction with the BBC's "Family Wanted" campaign featuring Nicky Campbell, who was adopted a few days after he was born . </P>

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