Many, many thanks, Johnnie.
To cut to the chase, my license was revoked following a DVLA-arranged and paid for Field of Vision test at Specsavers.
I failed this test which is when I received the DVLA letter listing seven criteria to apply for exceptional case status. I waited for a year to elapse since my SAH and had an appointment with Head Orthoptician at my local hospital. She kindly wrote to the DVLA to support my claim.
After MANY weeks the DVLA asked me to request her support to confirm that I had adapted efficiently to my loss of peripheral vision. The thing is, neither she nor my GP really know me from Adam, but she did say that I play League standard table-tennis, walk on obscur public footpaths in the countryside, and shop and cook as before.
The Occupational Health team checked my everyday skills for a couple of weeks immediately following the SAH.
I have advised the DVLA of the foregoing, and I would be prepared for any test or assessment of my driving.
When I refer to the field of Vision test, I am presuming that it is the same thing as the Easterman test.
I hope this clarifies my situation.
Once again, I cannot thank you enough for your knowledge and help; also this wonderful website. I shall take your sage advice also to search quadrantanopia on this site.
Vincent.