ZZR1100 start issue...

The Mighty Ruby give some hassles for the first time...
Stats/history/relevant(?) blurb:
Stock ZZR1100D, K&N filter, 58,xxx km, has had regular oil services, but the plugs are probably well overdue for replacement.
What happened:
Niari and I went for one of our regular brekky runs in the hills. Parked up and had heart-attack-on-a-plate. All good. Went to start, and it cranked vigorously, but no life. Added more choke, repeat, ditto. Went to full choke, added a blip of throttle at start of crank, ditto. Thought maybe I'd flooded it, put the choke off, wide throttle for the first few seconds of cranking, ditto. With 20 or so bikes there and no shortage of people looking on, I'm not enjoying this! It was parked with the back wheel resting on the storm drain at the kerb in a row of bikes, so I pushed it out and a few meters down the road past the last of the parked bikes. Pushed the button and it started instantly - like there was never anything wrong. Ran perfect on the way back to Nairi's place. (Though I think I noticed very slight hesitation under very light throttle - for me this is consistent and typical of plugs past use-by specs).
And then:
Fast forward a few hours to that night (after watching Jacks amazing ride in the wet) and it's time to go home. Much vigorous cranking and much ditto-ing later, nada. Not a cough, or hint of firing. Commandeered Niari's car and went home... )-8
My suspects:
Side-stand switch, clutch switch or one of those things killing the spark? (Although cranking with the clutch pulled didn't change anything).
Maybe ignitor failure? But wouldn't this be one - the other two cylinders would fire?
Bad kill switch contact?
My head hurts - anything else that I should look into? I want to do whatever homework I can before the time so when I go back there, I have a plan-of-action and at least a chance of having the right tools/bits with me.
Cheers
Stats/history/relevant(?) blurb:
Stock ZZR1100D, K&N filter, 58,xxx km, has had regular oil services, but the plugs are probably well overdue for replacement.
What happened:
Niari and I went for one of our regular brekky runs in the hills. Parked up and had heart-attack-on-a-plate. All good. Went to start, and it cranked vigorously, but no life. Added more choke, repeat, ditto. Went to full choke, added a blip of throttle at start of crank, ditto. Thought maybe I'd flooded it, put the choke off, wide throttle for the first few seconds of cranking, ditto. With 20 or so bikes there and no shortage of people looking on, I'm not enjoying this! It was parked with the back wheel resting on the storm drain at the kerb in a row of bikes, so I pushed it out and a few meters down the road past the last of the parked bikes. Pushed the button and it started instantly - like there was never anything wrong. Ran perfect on the way back to Nairi's place. (Though I think I noticed very slight hesitation under very light throttle - for me this is consistent and typical of plugs past use-by specs).
And then:
Fast forward a few hours to that night (after watching Jacks amazing ride in the wet) and it's time to go home. Much vigorous cranking and much ditto-ing later, nada. Not a cough, or hint of firing. Commandeered Niari's car and went home... )-8
My suspects:
Side-stand switch, clutch switch or one of those things killing the spark? (Although cranking with the clutch pulled didn't change anything).
Maybe ignitor failure? But wouldn't this be one - the other two cylinders would fire?
Bad kill switch contact?
My head hurts - anything else that I should look into? I want to do whatever homework I can before the time so when I go back there, I have a plan-of-action and at least a chance of having the right tools/bits with me.
Cheers