TeeDub,
If you go to the FAA website you can pull up registrations by State/Country, etc. Or fi you are interested in finding a particular type you can search the type and it will show any registered in the UK.
I've looked before and a lot of the "N" reg aircraft with UK addresses seem to be registered to the same company, some kind of company set up to allow UK citizens with FAA certificates to own a US reg aircraft I imagine., but there are some corporate owned aircraft on there too.
Another somewhat time consuming option is to pick up a copy of Aircraft Illustrated. It lists aircraft movements for the major UK airports so the planespotter geeks can keep track of unusual traffic. Just look for the "N" registered aircraft and then look up the "N"-number on the FAA webiste. It's a lot of work and most aircraft are going to be transient, but you may find a UK based aircraft in there somewhere.
Good Luck!
PS Where you from?