Answering my own question… Our support company PTFS Europe have cracked this one. Apparently this has been seen with other 18.11 sites. The problem is with the fines.pl script taking hours and hours to run. Seems the job gets the total number of days between the due date and now. Then it iterates through every day checking if it is a holiday and if it is, decrements the total number of days. The problem is that it is only checking a couple of days a second. We have lots of “old” fines- back to 2013 and the checking was taking ages. PTFS have advised there's a caching mechanism that the problematic part of the fines calculation should be using but wasn't. They have now enable memcached to start using the cache. This allows the fine calculation to cache a particularly expensive query, reducing the time to calculate a 7 year old fine from 53s to 4s. Apparently a line has been added to our koha-conf file to cause memcached to start using the cache. Fingers crossed that fines.pl will now run correctly overnight.
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