Hi,
Am I right in thinking that if you are T1 you cannot have a "vocational" licence any longer?
I had my licence revoked about 8 years ago because of failing eyesight, but previous to that I started taking PCV lessons. When I applied for the catagory to be put on my licence the doctor told me that it was not worth persuing as the DVLA were about to stop T1's from holding LGV/PCV entitlements.
As a matter of interest, it isn't only the rapid changes in blood sugar levels that make driving with diabetes more risky but also the fact that your eyesight can change, both short term (before hypos or when BS is too high) and longer term. And, in my experience, you simply can't tell what you can't see until you have a sight test, or hit something.