Not an answer as such DD but it is
total hypo unawareness that is considered a contraindication to driving.awareness )
Many people with T1 have awareness at a lower than normal level . I don't think that it is a matter of recognising every time you slip a bit below 4 since that isn't really a level at which you have cognitive dysfunction It's just for those of us taking insulin a level to be proactive at.
If you were always aware of levels of 4mmol/l then you would never have a hypo. That isn't the case , most T1s (on average) have at least a couple of hypos (that is levels of less than 4mmol/l) every week.
If you aren't recognising some symptoms, albeit subtle (ie not always lots of sweating or shaking) below 3mmol/l then it is perhaps a different matter. .
Here is what DUK says in it's guidance and advice to 'professionals'. I think the second bit that I've highlighted is important and I would certainly lose my licence here in France if I didn't recognise hypos at levels below 3mmol/l.
How should we define hypoglycaemia unawareness?
There is no clear guidance on this. For Group 1 drivers the new regulations allow for a
licence to be revoked or refused if the patient has impaired awareness and require this if
there is complete unawareness. As there is evidence for cognitive dysfunction around
3mmol/L, people who are asymptomatic when under this glucose concentration are at risk
for impaired performance without awareness. Given the inter-person variability for this
and the margin for error in home glucose monitoring, a clinical assessment is advised.
Group 2 drivers are required to have full awareness of hypoglycaemia and any degree of
impaired awareness would result in the licence being revoked or refused.
What about confirmed asymptomatic biochemical hypoglycaemia?
A person’s home glucose monitoring may show episodes of blood glucose below 3mmol/L
for which the patient reports no symptoms or there may be biochemical evidence of
asymptomatic hypoglycaemia on capillary glucose testing. This supports a diagnosis of
hypoglycaemia unawareness. If hypoglycaemia below 3mmol/L without any subjective
awareness is characteristic of someone’s hypoglycaemia experience, they may be defined as
completely unaware and should report this to the DVLA and be advised not to drive
http://www.diabetes.org.uk/Document...riving-diabetes-professional-guidance0212.pdf