If had conflicting advice from doctors one says reduce carbs to a bare minimum the other says eating more carbs help your body to balance the blood sugars better but I could probably do with cutting out potato altogether.
Heggars, do you test at home, around your eating?
When I was first diagnosed that was one of the first things I started so that I had immediate feedback on my condition. For me, that testing showed that my body didn't deal with some carbs too well. For me, those were pasta, potatoes, bread and of course the sugary things. Curiously, I have always been able to eat oats, where lots of others just can't.
In your shoes, I would consider ditching all the big carbs - by that I mean fruit (bananas are sugar bombs), bread and pasta, - no matter what colour they are! Doing that would probably leave you hungry, so increase protein a bit and leafy (not root) vegetables a lot. I would be surprised if your bloods didn't come down a bit, and you would be likely to lose weight.
To be clear, you could have a few days or a week where your weight actually goes up following my suggestion, as you would be consuming bulky veg, which can weigh heavy on the scales. I know if I eat normally for me, I know what my weight would be. If I gorge on veg, next morning my weight will be up, then sort itself out over a couple of days.
And drink plenty of water.
As you can tell, I would tend to go along with your doc who isn't a carb fan. In my experience, I can eat skip loads of food and maintain my weight (I'm very slight) when not eating carbs. Carbs are the naughties to us all, although moreso for diabetics.