Hi again. Had good success with cloning via Chris's video, notes above and one other tweak to deal with an error thrown when installing the zip file to Moodle.
However (there's usually one!), I get a curious interaction between Fordson and Fordson2 when setting the latter up.
So, I install an image (call it imageA) in Fordson > Custom image settings > Default header image. This shows fine on the course with which I'm using Fordson.
I install a different image (call it imageB) in Fordson2 to use with a different course and it won't show. But if I put imageA into Fordson2> … >Default header image, it will show in the Fordson2 course. So I don;t think it's an image problem.
Not least because if I install imageB in both Fordson and Fordson2, it will show in courses which use F and F2 respectively.
But I'm not able to get different images showing in different courses - which is the whole point of cloning the theme in the first place!
I've had a look at headerdefaultimage in the code for Fordson2 and I can't see anything obviously the matter (such as fordson rather than fordson2 being linked to it).
Any ideas for resolving this or what to look for would be much appreciated. I'm not a php coder so need all the help I can get.