Thanks to each of you ! This is great. I keep the bike in the Blue Mountains so when I see her next week I'm going with Albervin's advice and simply try some throttle/ no choke. Btw, I think the plugs are NGK BR8ES, but I'll check. I've always had this prob, BigEd, since four years ago. If no go, then it's a BT-H, which I'll ask someone experienced (more nouse ) to fit for me.
Onwards and upwards and thanks again, Ian