[Murph]

Thanks, I went back and tried again and got them working, so as you said I must have had some sort of typo in either the mission name or the map name in my config.ini.
Unfortunately, while I was trying to figure this all out I decided to use winmerge to combine all of my .ini files and put them all in my STD folder- all buildings, objects airfields, etc. are now no longer loading, so all of my maps are empty of everything but the landscape itself!
Looks like I'll have to go back and start again from scratch, with a fresh Il2 folder and install all of the mods again (sigh)...