I'm pretty sure that there is no variance, Geoff, but DVLA do reserve the right to delve into your medical history if they see something that they are not happy with.
If there was to be a variance they would have to let you know on the application, but what they have done is to bring the more severe medical test down to the lower weight class.
I've got an interview this morning with a lady from the Institute for Cancer Research, they are doing a study into breast cancer in men. Had to dig back through my family history a bit!
Please do not think this is not any sort of argument, as I think we get on OK - just a discussion about the thinking behind the medical criteria
DVLA do not publish the medical criteria for any licence, as far as I know, so how would they publish a 'variance'?
I also wonder whether DVLA have their own 'Doctors', whether they outsource the decisions and who within DVLA does the Medical Quality Control.
It is a bit of a worry, since the rest of the organisation seems to be somewhat inefficient. - they do not have a Legal Department and rely on the DfT Legal Department, who seem not want to bother with DVLA matters, from my experience.
The worry for us is that we do not know on whose head rests the decision about what may be a big part of our lives - more for you than I.
Sometimes I niggle at these problems more than maybe I should, but I feel that if somebody does not do it then there is no accountability in some Government Agencies and they sit back and just wait for their pension.