wellygary: Water meters also have another often overlooked benefit, they are very useful in tracking down leaks in the street mains,
The councils have meters on the major junctions and pumping plants that record the amount of water that goes through those points, by combining this with the sum of water meters from the "downstream" users it is easy to determine where significant losses are occurring in the distribution network, - It is estimated that many networks lose up to 20% in pipe leakage,, before it gets to the end user.
If water meters encourage more people to put in rainwater tanks for garden use all the better, there is no need to use high standard potable water to keep your garden green,
And I don't suppose that there are any annual standards for leakage reduction that they are obliged to abide by either!

