I had the same problem here in North Wales last year, Ian, and do not expect it will be any easier this year.
Part of the problem is the list of lecturers in the NWPA directory is getting smaller as people get older and stop giving lectures, and these people do not seem to be being replaced. There are really some good lecturers out there who are willing to travel, but with charges of £100 or so for an evening, plus travelling costs, this becomes prohibitive to small clubs.
There is the possibility of lecturers from your own club swapping nights with lecturers from other clubs, and also there are cd's available from the RPS, PAGB, etc with judges giving their opinions on the images shown. These cd's are always good to have in the event of a no-show by someone, plans do go wrong for us all at times.
Perhaps there is a chance of a list of judges and lecturers, along with areas they are willing to cover, to be created as a sticky on TP? I know several programme secretaries who would appreciate such a resource. I will RTM this post so that the mods see it, you never know!