Will let you know how I get on with the quotes. So far ive got £37 a month for joint cover from a standard comparison site, and same through my unions service. The insurance surgery which I was referred to from this site believes they can get me £29 - £34 but won't know until I have done the questionnaire and then confirm with the insurance company. So far they seem to be more detailed with the questions.
As mentioned before it helps to have a good Hba1c and its worth shopping around. You will get sick of answering questions, and with the specialist ones you won't get an instant quote, but think they might get the better quote so worth it.
Will keep you posted.