While I am typically apprehensive about large group rides, this one was ok. Everyone on the ride was competent. I suspect the cold had a way of filtering out the less dedicated riders.
I had a chance to talk to two, Stefan from Hungary and James the '91 K100RS rider.
I could see doing this again.
The app in mid-upgrade to Capacitor 7 and with all the viewer/editor changes I've made failed spectacularly however the track did get recorded so I've exported it as a GPX file that I'll try to upload.