Colleen, I'm curious. Is it that you want to see the British Isles, or are you just hooked on cruising?
I love everything about the U.K., but not sure I could imagine cruising around it. For most of Europe and Britain, I think land travel is the way to go, but that's just my opinion.
I'm a newby at cruising in Europe, so I'll have reserve judgement until after my June cruise, but I've always thought that for most of Europe (except the Med and the Norwegian Fjords), a cruise would not give me the time I needed to really get a feel for places.