Well I don't know where you live in Northern Ireland but there is a place in carrickfergus that rescues rabbits they may board, although then again they probably don't. You could contact the rabbit club of Northern Ireland and see if anyone could help out or knows of somewhere. Anyway definitly phone up the rescue centre in Carrickfergus, maybe they know of a good boarder or the vets they use may board.
Northern Ireland stinks in terms of good rabbit vets etc, I have been to many vets and have found one that is satisfactory although if I knew of somewhere better I would switch.
Good luck and I hope you find somewhere!