Many thanks - Just checking /var/log/syslog and I don’t see any entries in there. (created the cron job yesterday) Should cron log any output if it is successful?
I’ve since changed the cron job to specify the root user and they are now running according to /var/syslog.
However, I see the following two lines after each cron job in syslog
(CRON) info (No MTA installed, discarding output)
The message seems to relate to the absence of postfix or otherwise - however there is nothing in the self-host documentation that mentions installing it.