Fred Olsen are doing a cruise on board the Black Prince departing 31 July 2008 for 9 nights from Liverpool.
I think you are probably addressing this question to the wrong audience. You may find what you want but the closest I can come to it is one of the larger ferries from Plymouth, Poole or perhaps Belfast or Dublin. The cruise agents are more likely to give you the best answer. Of course, I could be wrong ... Nei.