Ah good one G! So it is indeed a microlight owing to the calibrated and not indicated stall speed.
Yes according to the manual, the max weight seems to vary depending on some kind of registration? I don't really understand though.
Just a final quick one as I can't remember the rules - can such a microlight legally enter controlled airspace (excluding class A) in VFR so long as it has a radio and transponder (and clearance!)?
Thanks guys, just the discussion/clarification I was after!