My side stand switch acted up a couple of times - needing an extra nudge for the switch to break continuity and the engine fire up. Out of interest I dismantled the switch and found that the spring-loaded metal plunger that is actuated by the side stand passes through the switch body was bone-dry, with no lube. a small smear of lithium grease did the trick, and the switch works smoothly now.
The switch plunger has a neoprene dust cover round it, to keep grease in and crap out. Perhaps just add the switch to the list of things on the enfield that need checked, cleaned and lube'd on a regular basis? It isn't a big deal.
Cheers,
Blair