As for the one around Leeds I think you'll find that will have been 509 (G-UH1H).
I know a Huey when I see one, even if it aint green:
http://www.airliners.net/open.file/1167732/M
G-HUEY paperwork looks good to me, with a permit to fly expiry date of 1st March 2008.....according to the CAA G-INFO website.
So theres now 3. Like London buses, none and then 3 come along at once...