Since the VM site had its overhaul and re-layout the "Web Safe" settings page seems to be broken.
Previously you could have any combination of "Categories", "Sites Blocked", "Site Allowed" etc.
However now it seems that randomly everything deactivated (thanks Virgin!) - when I turn it back on I can select Categories and save them, but then the allowed / blocked websites lists are cleared.
I can then re-add sites to the "Blocked" list, but when I do that, the categories seem to reset back to none selected...
It seems the whole thing has been broken...