Well, I checked what Earth leads I could find. Ie the one from battery to chassis, from chassis to gearbox, and from rocker cover to coil. Gave them all a good tug and they all seem intact although the mountings look a bit corroded. Should I remove them and clean them up?
A mate has suggested it might be my ignition switch intermittently cutting out the engine. Is this possible?ÂÂÂ