Yesterday everything worked but the right side indicators and the horns.
It took a bit of fixing and in the end I had to replace a 6 pin connector block with a new one as it was stopping the pins making proper connections. I also looked at the left switchgear and removed the plastic sheathing in order to run a wire from the switch to earth as this was why the horns would not work. The Laverda ND switchgear runs the horn button to earth to make the horns activate, and without an adequate earth it was stopping them working.
So, all is complete now and I can move on to the next problem.
Plenty still to do but I will start with timing the ignition and replacing the cam chain and setting valve clearances.
Beer o'clock now though!