I had no response from anyone on the forum however I did get a reply from Diabetes UK and so I thought I would share this with you.
There is no evidence to show that there is a risk for people with diabetes that they are aware of and as long as your dentist has receommended or agreed for you to have the treatment then there is no reason why you should not have it.
I am booked in to have mine done this week (in preparation for my Wedding in a few months), I will let you know how it goes.
Hope this has helped answer any queries you may also have.