I just noticed through random chance that there was a new release back in January: https://metacpan.org/release/OpenGuides I mention in case anyone is interested.
It's been a very long time since I even thought about OpenGuides, I'm afraid. But since for the first time since I can remember I got emailed by london.openguides.org (with a user who was mainly trying ot leave a message about how out of date everything is). And according to my email archives it's being in "wind down" state for about a decade... I think it accidentally regained editability after a sever migration a few years ago.
Neither cambridge, london or oxford are being actively used or maintained by anyone, as far as I know, for many years, so it's probably time I (not-so?)-gracefully turn them all off.