Quick fettle that wasn't.
Gave headset on the mixte a good tighten, feel ok, will test it next ride. Then fiddle with the front mech on the Scott. Reasonable after about 30 minutes of fiddling. We'll see...
Hang on, what's that clicking? Chain jumping. No stiff links. Damn, seems to be the lower jockey wheel. No idea why, or how to stop it. Far too irritating to ride it like that. Mech swap...
This is a Sora 3300 GS, and it's always been pretty flawless. The only spare I have is an old 7-speed Altus, the original from the 2001 Trek mtb. Oh well...
Took about 15 minutes to dial it in, and despite the cage length being very similar to the Sora, it does not need the hanger extender. Massive jockey wheels, though. Must be longer in some dimension, as I needed to refit the links I'd removed some weeks back. All good, now to ride it...