There's not a lot you can do with a particular fingerprick result other than understanding why it is what it is. The biggest single influence on your current BG is your food, and in particular the carbohydrate in your food.
For me, the point of constructive FP testing is to assess how well your insulin system deals with the carb load in a particular meal. Take a baseline reading, eat the meal, and test again at the two hour point - by when your insulin system should have brought your BG back to around the baseline. If it is more than 2 mmol/l above the baseline, your system couldn't cope with the carb/glucose in the meal. You can't get that sort of food response information with an HbA1c. And you can't get a long-term indication from a fingerprick test. They're different tests for different purposes.
In my experience the only test that UK GPs are interested in is the HbA1c. That is at least partly because all the NICE targets and "best practice" guidelines for T2 are written with HbA1cs as the required measurement. In my view setting "ideal" BG levels that are definitely at abnormal levels, as these do, is not helpful. But the problem with deciding that you "don't believe most of anything taught about diabetes" is that you run the risk of throwing out the baby with the bathwater. What is it exactly that you don't believe?