This may quite possibly have been Operator Error...
Having lost the draft anyway - I left it open on my laptop and the damned thing restarted overnight - I had to start over:
- First time, I started from the broken link in my User Page - https://zedwork.co.uk/wiki/Minecart - and got those error messages embedded in my previous post when I tried to save or view.
- This time, admittedly on a different computer, I started by entering the URL of the required new page - https://zedwork.co.uk/wiki/Minecart - and I was able to not only edit it but save the changes!
Please note though that the two URLs are actually identical but accessed differently.
To answer Zedwick's questions, Yes I am logged in and Yes I can edit my own user page, as can be seen from the addendum at the foot of that page -
https://zedwork.co.uk/wiki/User:LousyMinerUnforunately, too many variables were changed in the process of replicating and investigating this issue that I cannot now reliably state or trace which was the culprit. So, nothing to see here now, please move along (dons coat)
Mellorian, I'll create a Wiki Page for Minecart and from it a template for new Region pages, and I'll submit the latter for review via a Sandbox link as suggested.