Hehe. I never even met my sidestand switch - it was junked long before I met the bike. The PO had removed the switch and twisted the wires together in that nest beside the battery. The problem was a break in the black wire which runs to earth somewhere in the loom. It had obviously been dodgy for some time (hence the intermittent backfires and stoppages) and decided yesterday to give it up altogether. I have made a new connection from the black/white wire in the sidestand circuit to the battery earth, and now it runs fine. I've also taken the opportunity to fit a new main fuse unit with mini-blade fuse to replace the rusty glass job that was about to fail very soon (on the A40 in the rain, probably), so all in all a good day's work.
Many thanks to Wolfzero for the lightning diagnosis - spot on, buddy.
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