Monmouth

Hi
Newcomer here who has had this wonderful car for 4 months of trouble free motoring until now . Started about a week ago when the car had noise coming from what apear to be from the drivers rear wheel. Susected that it was the wheel bearing . Read on a forum that it could be feathering of tyres . So today swopped the wheels around and the noise is still present but moved to what seems a more central position , Basically looking for suggestions on what it could be and the best way of checking for it . Wheel bearings , propshaft , driveshaft or electric motor ? The noise is a humming sound , sounds like an angry wasp which is not there until about 30mph but gets louder the faster you go , Any suggestions welcome Thanks Dave