Ok I had a bit of a play with the float levels. :?
I turned the front nut one 360deg rotation and the rear 360deg rotation in the opposite direction(given that the rear was too high and the front too low, in poor light it looked like they had changed slightly ) and I also screwed in both idle mixture screws untill they seated and then screwed them 2 full 360deg turns out.
Now at 1000rpm idle it only fluctuates about 300rpms.
Bring back the webers !!!!!!
Am I on the right track?