Thanks Andy, after an hour and a half on the phone today I managed to get pointed in the right direction. I've to make an enquiry to a specific department of the revenue commissioners. I sent all the details off and hopefully I'll hear a response soon letting me know if they will register the bike in Ireland. I've heard people say that they will ask for an affidavit so hopefully that's all I'll have to do. If they reject it I'll need a V5 for sure.