Heheh. It was probably a patrol ship or a gunboat or some crappy little ship like that. The RN used to name it's ship classes like that - there were Castle-class, River-class, Bay-class, etc. - I wouldn't be surprised if there was a Fish-class as well.
The current naming scheme is a bit ****e IMO - the type 42s (destroyers) are named after towns and cities, as are many of the frigates (types 21, 22, 23). They still use some of the old names, though - there's still an Iron Duke, for example, and the new carriers are rumoured to be named Prince of Wales (bad omen?

) and Queen Elizabeth. No Ark Royal though...
