Well Agile, there are a few flight schools that are US-only and have their own EASA ATO number. Like Flight Safety or the NTPS. Most of them are for special training or type ratings, but there are a few fixed wing schools. No helicopter though. Therefore Hillsboro must do as you mentioned and borrow a European number ... and I found it finally. It is RotorSky from Austria. Therefore you get an EASA license and no UK license. I don't know if rhal96 wants that.