Unfortunately we have another problem.
A script I modified deleted everything (it seems to have done
rm -rf / but thankfully not running as root).
So I am now restoring files from backup, which was last made today 6am GMT.
At the moment:
UKP fixed but images won't load for the next 4 hours.
UKE will be down for the next 12 hours (I have to upload a lot because of all the gigabytes of media).
All image uploads (e.g. avatars) to UKP and UKE since last backup today (time above) have been lost.
Everything else is fine (i.e. no posts lost, databases for all sites 100% up-to-date and fine).