Hi Graham, this is something you have to buy from a pharmacy and the good ones are quite expensive. I get mine for free because I am diabetic but that is in France so you would have to ask your doctor. I think in the UK, the dont like T2 testing so they dont issue machines. DO NOT be tempted to buy one of those watches that advertise no more finger pricks and just use a bit of sweat. Turns out they cant do BG yet but that is what they advertise as.
If you are doing your readings but want a converstion chart, there are plenty on the internet. My machine measures in mg/dL whatever they are and to convert to what my HbA1c results come as mmol.mol I convert by dividing by 18.5. So this morning my mg/dL was 59 (yes very low) converted this is 3.18, More normal for me is around 75 to 85 which converts to 4.05 to 4.5.
Moving on, if you are wanting to convert it to a HbA1c equivalent you would have to be doing several tests per day to get a mean average (say 4 times at different stages of food). For example, I asked my doctor why my HbA1c was 6.3 when my daily morning average is around 4.5 to 5.0. Then I did a 4 times a day test, worked out the average and guess what, it was around 6.3, same as my HbA1c. Hope that helps. If not, throw the question back and give me some figures are what scale you are using.