I am told that if you have a stand alone FAA licence you can get a school to write to CAA with all your info ( need min of class 2 medical) and you should get dispensation for two years to carry on flying G reg in UK . Naturally you can continue flying N reg as usual . This will save me a load of money and a load of time as I have no type certificates and fly at least 6 different types SE and ME !!