<Tr> <Th> Average urban domestic water and sewer bill for 20m3 </Th> <Td> £ 27.5 / month (2008--09) </Td> </Tr> <Tr> <Th> Share of household metering </Th> <Td> 33% (2008) </Td> </Tr> <Tr> <Th> Non-revenue water </Th> <Td> 19% </Td> </Tr> <Tr> <Th> Share of collected waste water treated </Th> <Td> 100% </Td> </Tr>

When were water meters introduced in the uk