Put a trainer tyre on the bike, which is currently on the trainer. Was a bit of a faff, as that rim seems to make fitting any tyre a bit of a nightmare. Got it done eventually, got the trainer set up and calibrated again. Set off to only have the quicklink on the chain explode.
I didn't have any spare quicklinks, so I had to join the chain using spare bits of chain I'd kept after fitting the new one, and fiddling with the chain tool until the links were mobile again. Worked fine, but I'm glad I've stuck with 8 speed stuff and not gone with more gears. I'd have had no chance with a 10 speed chain without quicklinks.