In addition to advising the DVLA you must advise any Insurance companies that you are with and you may need to shop around for alternative quotes should they try to load your premiums unnecessarily.
Diabetes UK have special insurance schemes for their members. They are very reasonably priced and will probably save you a lot of money. You will find the insurance staff understanding of your condition and extremely easy to deal with - arranging everything, with minimal paperwork needed on your part.
Diabetes UK Insurance Services
0800 731 7431