The accuracy of flow meters ...

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The accuracy of flow meters is achieved though weight table measurement. Water is weighed and this gives a true value for the volume. National Physics Laboratory  is one body that offers such a facility. I'm sure there are Standards (BS, ISO etc) that meters have to comply with. Water companies change out meters on a planned basis to account for when inaccuracies might begin to occur. Accuracy is flow dependent for different types of meter. Meter under-registration is a well documented phenomenon. When undertaking studies in different parts of the World into things like leakage, engineers would often take a well calibrated meter to assess the validity of local meters. Hope this answers?