If you’re diabetic the NHS diet does not take this into account. As someone up thread said carbs are the problem so cut down on bread, pasta, rice, cakes, biscuits, sugary tropical fruits, other root veg, alcohol, crisps etc.
Increase legumes, green veg and protein including salt free nuts. This encourages your body to begin to burn fat and no calorie counting. It may also help your diabetes. Michael Moseley reversed his diabetes by following this regime.
Over lockdown I lost a stone in weight and am no longer prediabetic. Diabetes.co.uk have discussions about the NHS weight loss programme. The programme seem to be run by weight loss companies and Weightwatchers has been mentioned.
Anyway, good luck