The current situation is grossly unfair. Neighbours can get bills hundreds of pounds different annually: one (metered) can be frugal yet pay much more, while another (not metered) constantly sprinkles lawns, washes cars, fills paddling-pools – and pays much less.
It is an affront to personal freedom. How can it be fair that I am not permitted to remove a water meter, when my neighbour doesn't have one?
By all means encourage saving water. But let's all be in it together! Compulsorily metering some people but not others puts a disproportionate burden on them to make the savings.
It could also be a public health issue. Poorer (but metered) people may skimp on washing, toilet-flushing etc. Elderly people, or anyone, might risk dehydration by being too worried about the cost to take a drink. Metering also discourages washing-out recycled bottles etc.
People should be allowed the freedom to choose. True freedom – not only when their choice matches what Water Companies want them to do!