So, I'm pretty happy that the 240 is now a reliable, solid car at last!
I'll definitely still be updating this thread with the remainder of the little jobs to do, such as painting the sills and fixing a few other niggles that need done. I have the daft notion that I may at some point fit a K cam just to see how it goes, plus I need to do a little bit of welding on the doors to really call the car 'rust free'. Most of all though I just intend to enjoy it.
In the meantime though I'm turning my main focus to my other project, which I just got moved to my place at the weekend.
I've started a thread over on the relevant section if anyone is interested in how that goes:
https://www.volvoforums.org.uk/showthread.php?t=324503