InterNations London Singles group?
I'm sure that whoever set up this group is full of good intentions. But, as Activity groups are about getting together people with similar interests which should be somewhat specific, it would make more sense perhaps to create a Internations Couples group rather than a Singles group, as over 90% of the people that I know in Internations (could I have come across a biased sample?) are single. :)
Hope the group is a success, anyway, and that it does not become a platform for event organizers to push some of those pervasive singles events.