On the subject of insurance, contact Diabetes UK. they are good at sorting things like that.
As a young T1 diabetic, I would recommend you read Dr. Bernstein's diabetes solution.
His methods are regarded as contravesial by the medical establishment, but he's a lifelong diabetic himself and the method works. ( the standard method of control advocated by NHS usually does only partially) You have many years ahead to need your health. The better you keep control, the less likely you are to have problems later.