Islet transplants have been knocking around for few years in various forms plus it appears you get it done on the NHS but there a fair few hoops you have jump through before you are approved, you will have to use Google if you want more info.
Personally I would not got for it because:
Immunosuppressant drugs are very unpleasant and you can end up very ill.
It is not a long term fix, you will have to go back to using insulin from anywhere between 1 to 5 years after transplant.
It's not a cure.
It's still experimental.
