A newsflash about this came round at work, I hadn't heard before. Apparently from 31st May there's a change to the way HbA1c results are reported. May reduce confusion for newbies who leave the surgery with a number such as 8 but don't know whether it's HbA1c or random glucose.
With the "old" measurement it was possible to convert the HBA1C % figure into an equivalent average mmol/l figure. However, the new measurement is in mmol per mol, not per litre. So my question to all you physicists out there is how do you convert mmol/mol into mmol/l?