Ok...so where is a good place to go to, to convert my FAA PPL to a EASA PPL? Also, are both PPLs stand-alones?
Any UK flying school would help you with this, but make sure you do the 100 hours first, so that you only have to do the two exams. You will need a few hours practice with a UK instructor pre-test getting used to UK weather, airspace and radio.
Once you have met the requirements (i.e. passed the two exams and your skill test) you will be issued with a stand alone EASA licence.