Yes many GPs like to see if an initial period of diet and lifestyle changes can reduce blood glucose levels without the need for prescribing medication.
One of the most effective strategies you can try is to reduce the total carbohydrate content (not just ‘of which sugars’) of your meals. There are obvious things like cakes, biscuits, sweets and sugary drinks that you will want to cut out straight away, but you might be surprised how much *all* carbohydrate affects your BG levels, including rice, pasta, potatoes, bread, pastry, grains, cereals and many fruits, so reducing portion sizes of these is a really important step.
Unfortunately there is no one fixed approach that will work for everyone, but many members here have found it helpful to begin trying to stick to 100g-130g of total carbohydrates throughout the day as a starting point.
Good luck and let us know how you get on 🙂