Technology moves faster than the law, in our world things move by the second in their's by the century.
I would have thought Gina buggerlugs was on a sticky wicket in pursuing opinions on an openly available site, surely she would have to pursue the contributor of the individual post, irrespective of its nation of origin, but I doubt that British law has anything on the statute books, nor a precedent to deal with it. So, if she wishes to pursue the point, it will probably keep a great number of legal eagles happy at great expense and to no conclusion!
As to whether your site needs indemnity, I will raise the point with just such a group of legal eagles with whom I drink, and, in the unlikely event that they have a consensus, report back!