I’m not putting out false hope, just because you don’t believe it. I reversed mine and I’ve had a normal A1C for 3 years, I know what the truth is. If you want to rename it “remission”, I don’t care, but mine is gone. Kaput. History. Never coming back because I’ll never stop eating this way.
Is it type 1 or type 2? If it’s type 2, it’s caused by poor diet and eating too many carbohydrates for your own personal physiology. You can totally reverse type 2 diabetes to a normal A1C (5.6 or less) with an ultra low carb diet. It might take 6 months or more depending on how high it is now, but may be a good way to go in the long run.
My wife has a Thai passport and a U.S. Passport. She arrives in Thailand and leaves Thailand on her Thai passport, and leaves the U.S. and arrives in the U.S. on her U.S. passport. No problems so far. Should be the same for the UK.