The HbA1c test measurements are meant to be universal. Prior to 2011 (I think it was 2011) they were all measured the same way, producing a percentage figure, such as 6.2%. From 2011 the measurement units changed, almost universally, to mmol/mol such as 44mmol/mol. However, some labs in the UK and a few countries elsewhere haven't yet adopted this new measurement system.
Our meters measure in different units again - mmol/l such as 7.3mmol/l, unless you are in America or a few other countries where they use yet another measurement unit mg/dl. All the conversion charts are on the main DCUK website if you look for them.