Thanks Martin - cool tip (groan). Well worth knowing.
I have just found a lot of water in the block connector for the ignition pick-up sensor - which seems pretty suspicious to me.
Once that is all dried out, I'll try the bike again with all my digits crossed.
BTW - That, there, what you're doing with that Multistrada in that picture - that's not natural, that's not. Stop it immediately.
.