New vac advance in, and what a difference. As expected, it now idles much better, and slower than before, started easer too, but not sure if that was just a fluke.
Also bought some other spare parts like a new reductor coil as the current one in the dizzy has a small hot spot on it and may be on borrowed time. Also a new ignition coil. I already had a spare BIM021 module and I have borrowed a fuel pump off Mick - thanks mate, so now I have a complete set of electrical bits for the 101, so I can fix any electrical fault that may occur on the side of the road. :)
Just need to take it for a road test to see if it still pings under full throttle.

