I got a policy from AVIVA in the end through an online broker called the insurance surgery
http://www.the-insurance-surgery.co.uk/
I basically seen an advert online asking if you have medical conditions and want insurance after being declined by Prudential.....
I got it no bother and I don't know if its good deal or not as this is my first time.........
I am 31 years old, type 1 for 16 years, overweight and have retinopathy/maculopathy all be it stable.........
give them a ring or email them, they were very helpful..........