I think most comments on this thread are from people with type 2.
Maybe the view from someone with type 1 may be interesting for someone reading this thread in the future. I have no intention to derail the thread but understand the OP has type 2.
When I was first diagnosed, I had my Hb1AC tested at 3 months, 6 months later, and ever since approximately 14 monthly to coincide with my annual diabetes review which is always late.
As my diabetes is treated with insulin, I have always had test strips and, very recently, Libre. With strips, I test more than 8 times a day (the reason I qualified for the Libre).
My diabetes is very much self-managed. The main reason I attend the annual review to get the results of my liver and kidney function which is done at the same time as the Hb1AC and cholesterol. It is also a chance for me to ask the chance of getting the latest pump, etc from the CCG.
If between reviews I see my BG rising, I have the tools I need to adjust my insulin dose and bring my BG down.
My diabetes team know I have the skills and knowledge for this and see no reason for additional tests, appointments and cost to the NHS. I agree wholeheartedly.
For people with type 1, I believe the NHS money is better spent providing the tools and education to self manage rather than constant testing.
This, of course, requires the patient to believe in the value of these tools. If they don't, I am not sure 3 or 6 monthly Hb1AC testing will help with motivation. Although the time spent with the doctor may ... if they turn up to the appointments