Bob
The diabetes UK website at
http://www.diabetes.co.u...blue-light-services.html says
"If your diabetes is treated with diet or diet and tablets, you may hold a licence to drive either a large good vehicle (LGV) or a passenger-carrying vehicle (PCV). If your diabetes is treated with insulin, you will be unable to hold either and LGV or a PCV licence. If your diabetes is treated with insulin, you will automatically lose the entitlement to drive vehicles within the C1/C1+E class. This includes vehicles between 3.5 and 7.5 tonnes with a trailer, up to a combined weight of 8.25 tonnes. However, you may apply to be assessed individually for fitness to drive these vehicles.".
The DVLA medical notes at
http://www.dft.gov.uk/dv.../pdf/leaflets/INF4D.ashx says much the same, as follows
"If you are an insulin treated diabetic you may NOT obtain a licence for categories C, C+E, D, D+E, D1 and D1+E UNLESS you held a HGV/PSV licence valid on 1 April 1991. The Traffic Commissioner in whose area you lived, or who issued the driving licence, will need to have had knowledge of the insulin treatment before 1 January 1991. Insulin treated diabetics applying for C1, C1+E categories (vehicles between 3.5 and 7.5 tonnes with a trailer up to a combined weight of 8.25 tonnes, or 12 tonnes will need a specialist assessment, and meet a strict criteria for diabetic control and the higher medical standards needed for large lorries (LGV).".
So, there does appear to be some scope for individual assessment for some LGV in the class C1 and C1+E categories.
The main issue appears to be the type of treatment that you use for control rather than the type of diabetes that you suffer from. It appear that the main considerations are the risk of hypo's with that treatment and the stability of control. It is interesting that they have homed in on insulin as a treatment as some oral treatments for diabetes do carry a higher risk of hypo than others, where the risk is low or negligible. In fairness some sufferers do have significant problems with control for a variety of reasons and this can take some 'experimentation' with different types of insulin to achieve, and some never do. Many people will not realise that some people suffering from type 2 diabetes are treated with insulin, or may use insulin in addition to oral medication as well. There are also relatively new treatments that are injected, but are not insulin.
To slightly broaden the discussion, there are cases where the entitlement to drive certain classes on an LGV licence may be withdrawn to a medical condition, but the person could continue to drive the same class of vehicle under 'grandfather rights' - off the top of my head C1 and C1+E. I actually have this as a case at work. One of our drivers who held a licence for LGV, had this taken away as his eyesight had deteriorated, but he is (legally) able to continue driving the SAME vehicle using his 'grandfather rights'. The driver himself is 'uncomfortable doing so, and both he and I find the situation slightly odd! I wrote to the DVLA and the response was that he doesn't meet the eyesight criteria for an LGV licence (hence it was withdrawn) but he meets the eyesight criteria for a 'car' and because he (like many of us took and passed his test some time ago) he has acquired 'grandfather rights' to drive the very same LGV vehicle. I am not sure if a similar scenario would apply to people suffering from other conditions such as diabetes though.
Ramble over, but hope this helps
Phil