From what I gathered from his close friend, he rents here in the UK in London when he's here, but lives in NYC where he has an apartment, as seen in the bathroom photo. Spondon is in Derby, it's a village, I very much doubt Gregg would even go there.
http://www.spondononline.co.uk/
Since Elvis died there have been many sightings all over the world and in some really crazy places. Does this mean it's really him or just people seeing what they want to see? I'm not saying it's impossible, just way way improbable, but we know enough to narrow down known haunts, those being studio locations, clients' locals, known associates and family. Anyway why would he wear that trademark hat now, it's like Elvis wearing his classic gold suit trying not to be spotted. I really think the guy mistook a random near lookalike, either as a joke or for real. This "Gregg's" answer only confirms what we already know. :)