Daniel Peacock

I haven't seen him in anything for a long time but he's a good actor and seeing as he's Trevor's son it would have been funny if he played the part of Jim's son.
He was in the porridge movie but you may remember him from Only Fools And Horses, he played Mental Mickey in an episode, Rodney joined a band.
Trevor has another son Harry who's also an actor who was in Dracula, Far From The Madding Crowd,Toast Of London - can't say I know his work.