Daniel (or anyone else!),
I have the same issue here - trying to opt back in but having no joy with the 'Manage BT wifi' page as it just keeps refreshing after I 'tick the box' (same issue as others had). Has there been any update since your March message? Really just looking for a way to opt back in and finding it much harder than it really should be.
Its been like that for months, BT don't seem to want to fix it and would rather the mods waste their precious time carrying out a task that the user should be able to accomplish themselves.