I find it hard to believe that there is only one covering a large area. It reached a point where there were so many RTF Examiners that there were simply not enough tests to go around. The last list seems to have missed out around 50% of them so I am sure if you dug out an older list you could find a few more hidden away.
The fundamental problem is that the CAA was dismantled internally and nobody has worked out how to reassemble it; those who were disenchanted with the process upped and left and it seems are still doing so.