I'd known something was way off with the carb setup from square one given that the idle speed was very high and I could tell with my nose from fifty feet away that she was running stinking rich. I decided to actually investigate that this afternoon and it didn't take long to work it out. The idle mixture screw was wound all the way in and firmly seated...So the carb idle circuit was doing precisely nothing. The only reason the car was idling at all was because the idle speed screw had been wound so far open that the throttle was held about 10% open and she was actually running from the main jet rather than the idle system.
Winding that open a couple of turns and backing off the idle speed adjustment (as that immediately shot up to about 3500rpm once I started to open the idle circuit up) soon got things much closer to where they're meant to be. I'll hook the CO meter to get it vaguely close to the book value when the rain stops. Now she's not running horrendously rich I'm glad to report that the intermittent but frequent miss at idle has vanished as well. Not expecting to get it absolutely perfect as I've no idea how stale a lot of the fuel in the tank is, but I don't reckon things are a million miles off now.
The even bigger positive of this than a smooth idle though is that apparently backing that adjustment screw out has resolved the issue I had with the accelerator pump being blocked off - that's now working properly it looks like.
Just wish the rain had held off for another hour or two.

Particularly annoying as the oil filter I'd been waiting for arrived this morning, so I really wanted to get the oil and filter changed today. Guess that's a job for later in the week now.
Nevertheless, it did give me an opportunity to get some gratuitous water beading photos on the freshly waxed paintwork...Imagine it's been a few years since this happened!








Feels like having the carb largely co-operating is quite a big step towards the car being actually drivable now. Rear spheres will be the next big step.











































