I guess as VH's plane is pretty modern it will be transponding mode C or even S,wouldn't have this displayed his FL to him and ATC?.
VH's aeroplane was a microlight, with a fairly basic combined digital instrument panel. I'm not sure if he had a transponder fitted or not, it's not a normal fit on the vast majority of microlights but one or two long-distance microlighters have fitted them, where the empty weight restriction makes this legally possible.
VP