Tyre off Triban's back wheel and onto my motor wheel, ditto cassette with the 12t cog knocked out to make it fit the freewheel. Wheel onto Triban, disc/caliper beautifully aligned thanks to one of those Birzman Cam doo-dahs - couldn't quite believe it. Battery mount on, connected everything up, works. Still have to secure cables to frame and root out a HB extension from the spares so that I can mount the console.
Somewhat underwhelmed by the Michelin self-sealing tube I put in: the valve stem isn't straight. Works though.
Found that the low-grade labourer who assembled the bike hadn't bothered to adjust the RD properly, so that it was hitting the the big sprockets. Fixed. Also limited the inward travel of the RD so that it won't change to a no-longer-there 11th cog.
Plumber silent, might have retired. Bugger. Dunno how long MrsT will tolerate having only one sink.