Arriving home at about 00:30 last night, I parked the bike on the sidestand and, thanks to the uneven concrete driveway noted that the bike was almost vertical. So I gave it a wriggle and waited a couple of seconds to make sure it was stable before opening the garage door.
The bloody thing waited until I was a yard away before creeping forward and toppling over to the left. I got to it before it hit the deck, but only succeeded in slowing the fall.
Knackered after a long day and with a naturally puny body, I then found I couldn't lift it back up. I've managed OK in the past, but with a full tank of fuel this time it was just too much.
I found a 4ft plank in the garage and slid one end under the bike just behind the tank until it contacted the decked footpeg then with one hand on the left handlebar and the other on the end of the plank it lifted up with no difficulty at all. Might help other 9-stone weaklings, or anyone with a dodgy back.