HI Tigger, welcome to the site. I too have done the kill switch thing, and..............the failing to turn the petrol on thing! Bike puttered to a halt just up the road, and whilst I was contemplating the problem, and coming up with the fact that I had forgotten to turn the petrol on, a kindl biker stopped to ask if I was ok!
(I said, yes fine thanks, have just fixed the problem!
)
And I don't dare use a disc lock, cos I know I'd never remember I had it on!