Thanks Eribanaut,
My problem seems to be actually getting near the higher figure. When I took the Puck out for her first proper run I went via my local weighbridge, with what I considered to be minimal personal contents she weighed in at 800Kg, the weighbridge had a + /- tolerance of 10Kg! So of course I told myself it was reading 10Kg over. So problem is I can't load her up with any more to get the weight up, in fact when I first tried, before moving everything to the front it was 40kg, so within the 4 and 7% which is reassuring. What I will do is take out the spare wheel, put it on my roof rack and put another 3.5kg dumpy gas bottle in the front locker together with the wheel clamp and put the EHU cable in the front of the side locker where the spare wheel normally lives, that should do it without going overweight.