This topic will generate a lot of replies!
Personally, it's a nightmare...
My Mrs and I bought our first place last year, and as such there were options for life insurance, etc. A long story short, the monthly premium was absolutely massive (somewhere around £90 pcm) and was void if I died from a diabetes related illness (whether chronic or acute).
As you'll know, diabetes affects all of the cardiovascular system so the most "likely" ways to die would not be covered.
You'll probably find that there are specialist insurers out there but they, like any other provider, will charge a good bit extra.
Grant