The DVLA states in appendix INF188/2 of "At a Glance Guide to the Current Medical Standards of Fitness to Drive"
YOU MUST INFORM TO THE DVLA IF:
The risk of hypoglycaemia (low blood sugar) is the main hazard to safe driving. Patients must be informed that warning signs of hypoglycaemia should not be ignored and if they are experiencing warning signs while driving must stop the vehicle as soon as safely possible (1).
Group 1 entitlement:
Severe hypoglycaemia (2)
The law defines 'severe' as an episode of hypoglycaemia requiring the assistance of another person.
Group 1 drivers - episodes of hypoglycaemia occurring during established sleep are no longer considered relevant for licensing purposes unless there are concerns regarding their hypoglycaemia awareness.
Group 2 drivers - must report all episodes of severe hypoglycaemia requiring the assistance of another person.
For more details guidance may be obtained from the publication "At a Glance Guide to the Current Medical Standards of Fitness to Drive" and the website www.dvla.gov.uk.
Reference:
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