NEW Back in time again!

John Simm is shocked when he digs into his family tree with his Life on Mars co-star Philip Glenister...

- NATASHA HOLT

DNA JOURNEY Wednesday, 9pm, ITV1 Factual (box set, ITVX)

Close friends and Life on Mars co-stars John Simm and Philip Glenister set off on a time-travelling adventure into their families' pasts this week that could rival their famous fantasy crime drama. Yet the opening episode of ITV1's latest series of DNA Journey almost didn't get made after John made a shock discovery...

'A revelation came out when my DNA results came back that my dad isn't my biological dad,' reveals the Grace star.