Hi and welcome,
I agree with the other comment here, the NHS standard advice is to eat a well balanced diet, try to exercise and reduce weight. I started with this advice until I found this site and the diet doctor website. What I read made sense to me and when I looked at the carb values of lots of the foods deemed healthy and well balanced I was quite shocked. They soon got taken out of my diet completely or replaced with the lowest carb version I could find. Luckily I didn’t have any other health worries and both my blood pressure and cholesterol were under the recommended levels.
In brief I was diagnosed in October last year and was given a chance to see what I could achieve with diet, no meds. I had my first checkup in February. Results are now prediabetic, blood pressure and cholesterol slightly lower than they were and I’m now 3 stone lighter. When I saw the diabetic nurse she was totally amazed, she asked what I’d done and when I mentioned low carb she smiled and said “yes, they can be bad for diabetics”!
You will find lots of help and advice here and will see that many of us have had great successes, good luck