After fettling, it would've been rude not to have gone for a test ride. The RD on the Rouen now shifts as it should, and I think I've managed to pin down why I get the chain rub on the FD if I don't trim it.
Wasn't paying attention to which gear I was in, and found myself on the big ring and not quite the biggest cog on the rear. And the chain was rubbing on the back left corner of the derailleur cage. So by that, I'm assuming that the FD is a touch squiffy, and it wants moving just a touch anti-clockwise. Will do that later in the week.
Also tweaked the bars on the Chartres. Now that I've got the cockpit just about right, I'd noticed the other day that the bars weren't quite square. So loosened the stem and made the appropriate changes. Hopefully that'll stop bugging me now. Also tightened up the QR skewer on the front.