We chose to have a water meter about 8 years ago. Initially, the bills were around £20 a month, for about 5 years. We did not change our usage and suddenly they shot up to £35 a month. We put up with it and six months later they went back to £20. By then we were considerably in credit and requested a refund. We got no response. We have never read the meter (under the footpath, way way down in the dark) and never seen anyone read it, but the bills indicate whether Customer or Water authority read. Several say Customer!! Also several of those read by the Water Authority are lower than their previous readings!!!!
In March 2023 the reading said Water Authority read and the bills was increased from £20-something to £58!!! During the previous six months we had been away for 3 weeks in the UK, plus 3 days over Christmas and - wait for it - 101 days on a World Cruise. So how did we use such a lot of water? No-one at home, no heating (left on but as low as is sensible), no baths, no dishwasher or washing machine, no garden to water - not even any being drunk? At the next bill in October the charge went down to £16 a month - a drop of £42. No explanation, and we were by then in credit by over £700. We are still waiting 9 months on for the promised refund.