by William Melton.
I believe I have found the problem. In my quest to be organised I set the prefix to the suggested "mdl_".
I edited all 26 database tables and changed them to mdl_.
This resulted in an Error: Site is being upgraded, please retry later.
Looks like I have to uninstall moodle and reinstall, making sure I use the prefix mdl_.
Thanks to all for your help.
Wil