Ok, I was wondering why my logs for a new Virtual Host were not being produced. I had thought they were relative to the DocumentRoot directory but no, log files, when relative, are relative to the ServerRoot directive.
This does not mean just replacing DocumentRoot with ServerRoot will solve the problem - you can only have one ServerRoot and it points to the directory for your server app.
You need to explicitly define the name of the log file if it is not relative to the serverroot value.
I hope this helps anyone who might have a similar problem. As always, the solution to this was found by RTFM.
Best regards,
Matt.
