Why did Peter Caffrey leave in Series 4?
(Possible Spoiler) In the episode Rock Bottom in Series 4, Paidraig O'Kelly gets in a taxi at the end to see his son in London (I presume) for a vacation and rides off. But he never came back.
Was this a decision of the actor, Peter Caffrey, or did the producers decide that enough had been done with his character?
Anyone have a possible solution to this mystery?