You can go to U-Switch and input your usage details (not the amount of water, how often you use appliances, use a bath/shower, run the tap for brushing teeth, use a garden hose/sprinkler/power washer for your car etc and for how long) and the size/number/type of people who live in your home.
I ran this to see whether I could qualify for a reduction in my bill if I went over to the Anglian Water 'SoLo' tarriff, which I'm currently on for my waste water (weirdly enough, they only provide that service in my area - Affinity [Three Valleys of old] provide the water), even on a fully metered supply - about a 25% reduction in my bill. A shame that the scheme is supposedly being scrapped in a couple of years.
IMO almost certainly any couple living in a 3 bed home or above will save if you go over to a meter - 2 bed house (a flat - certainly), still probably, but it depends on whether you wash your car and use a garen hose/sprinkler often and have baths rather than showers. Its amazing how much water they use.
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