Okay, sorry that was me just deleting "store" from the wrong field!
Okay, so it is now working. Phewww.
Must add that major setting to my list of things to CHECK before I upgrade all my stores.
However... now, if you look at the site, none of my product images are showing. Some of them were a few minutes ago, now there are none. Gosh what have I done!?
Do I need to start a new thread?