Johnson Stewart - based up here near Coleraine - he used to be a dealer for RE and knows them well. If you're prepared to travel up here I can try and locate his number for you?
I see Davy (formerly D'n'D Motorcycles) has surfaced again in Bangor, Co Down as Davy's Bikes and once again is an agent for RE.
I know that some on here have had issues with him in the past but I've found him OK for servicing, so assuming he's still using the Enfield-trained guy he had previously, might be worth a trip up.