Thanks for the replies. It good to see that at least in some cases the CMB are a bit more rational.
I've gone through the decode of the JMES I have been (temporarily) awarded and it still doesn't make any sense. I've also contacted the Consultant who saw me three years ago - fortunately a Col late RAMC - who might be able to provide clarity to the MB.
Again, I am fully fit, achieved late last year dark blue standards in the MSFT and have no other health 'issues'.