Sorry to bother again, I'm sure you're fed up of me by now!!
My partner was doing something on the site (and didn't write down what) but has somehow managed to disable all login functionality beyond what I can restore as well as make it so half of the products have disappeared.
They assure me they have not deleted them. And bizarrely as can be seen from screenshot attached, they appear to still be on the site, as they appear in categories saying there is 7 items. But in the catalogue menu in backend they have disappeared also.
Do you have any idea as to why please?