I must say I really only watched this programme for Tom Wilkinson, although the premise was intriguing, with the idea that a man finds out he is a clone & that there are other copies of him walking around, & the confrontation with his father about what happened. And despite a decent storyline, right from the start it was clear it was originally for the stage, with the dialogue very much in the style of a David Mamet play (Oleanna springs to mind), with the progression & dialogue unclear in many places.
The performances however can't be faulted, with excellent performances from Rhys Ifans & Tom Wilkinson, however perhaps the script would've been better adapted for television than taken directly from the play.