This is the user options on the global setup:-
Out of the 114 only 5 have actually responded to joomla's challenge and then revisited.
The reason I did this was for the forum. I didn't realize it opened the site up to hackers but none of the weird email owning registrants have been back to try it so I am not going to worry.
Anyway, the site is backed up every day automatically so I can roll back easily enough I suppose, if needed.