I had a meter fitted in January last year. Wouldn’t fit in the house so it’s in the front garden. Cost for the year was £510 in total. For a 3 bed semi, 2+2 kids. Regular, car, bike washing on driveway, watering garden etc. We have decided to go back to rateable value charging, as when the kids are older, we will use a lot more water! I’d check what the neighbours are paying as your current charging is higher than mine, and I live in posh suburbia as you know! :D