In episode one of this two part special, Ant and Dec take on their most personal journey yet, uncovering their family histories using a combination of DNA and genealogy.

Part two of two. Anthony McPartlin and Declan Donnelly embark on a journey to New York to follow the bloodlines of their mothers using DNA analysis and genealogy. There is a surprise for Dec as he finds out he has close family he never knew existed, while Ant's history takes him to the United Nations. After a whirlwind tour of the US, it's back to Ireland to investigate a family secret that Ant's family has been trying to unlock for years.

Freddie Flintoff and Jamie Redknapp face a new kind of challenge - discovering each other's family history using DNA and genealogy.

TV personalities Amanda Holden and Alan Carr embrace their family history on a road trip that covers Cornwall, London, and Erith.

Father and son duo Martin and Roman Kemp take a family road trip of a different kind, one that delves into their family history that spans North London and the North East.

Chasers Anne Hegerty and Shaun Wallace set off on a quest to discover where they come from and unearth secrets from their past in a life changing and emotional voyage of discovery.

Actors Dame Maureen Lipman and Rula Lenska, who met on the set of Corrie, come together to embark on a journey to uncover their family history, despite their very different backgrounds.

Olympic legends Torvill and Dean embark on a journey that brings them even closer, if that's possible. Chris discovers living relatives on his mum's side, and for Jayne, the origin of her sporting prowess is revealed by a connection to West Ham.

Comedians and best mates, Rob Beckett and Romesh Ranganathan, go on a road trip to find out about their family history using DNA and genealogy.

Daytime queens Kate Garraway and Alison Hammond embark on a road trip to find out about their family histories using a mix of DNA and genealogy.

Old pals and fellow comedians, Joel Dommett and Tom Allen delve into their family histories as they take a road trip around the UK.

Two Gavin and Stacey faves - Larry Lamb and Alison Steadman - embark on a road trip to find out their family history through DNA and genealogy.

Downton Abbey star Hugh Bonneville and top UK comedian John Bishop cement an unlikely friendship on a road trip to discover their family histories.

Anarchic comedian Johnny Vegas and funnyman broadcaster Alex Brooker's DNA road trip sees them uncover trailblazers and a link to Jack the Ripper.

Line of Duty stars Neil Morrissey and Adrian Dunbar's friendship began on an audition day for a drama school - now they are seeking out their pasts.

Dancers and sisters Oti and Motsi Mabuse head off on a moving journey across their glorious homeland of South Africa to discover their extraordinary family history.

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.

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

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.