Hi Bonnar_Bloke,
I haven't had a lot of opportunity to get stuck into this project, it will defiantly be a bit here, bit there exercise, none the less I'm keen and will keep the forum updated.
As to the suspect ignition, I'm quite confident the HT lead is intact, however where it enters the resin filled coil pack the lead has become loose and can rotate, metering it and wiggling the HT lead around I got the odd open circuit, but when manipulating the lead on its own the metering had no issues.
I can only conclude the lead connection down in the solid state coil is not good, however I just pumped a bit of Loctite 401 down there to try and keep it all in place and it ran okay, cant say I'm confident in it though.
I'm in the process of pulling the engine down for a clean up and paint job so wont get to try and run it again for a while.
I've looked around for a replacement coil but they are far from common, but I managed to find a donor engine which I hope to get in the next week or two, hopefully it has a good coil. There are new coils available from the UK but at around 45 pounds plus postage, I cant justify that expense.
Anyway, the more I've looked into these Scott Bonnar machines and Villiers I'm actually real bloody happy with my pick up, it is in great original condition and has not been mucked with at all.
Perfect restoration worthy piece.
Cheers!