My total bill from 02 Nov 2022 to 02 Nov 2023 came to a massive £153.19 inc standing charges - I just checked my quarterly bills.
To be "saving" £500 per year would mean drastic cuts for them, maybe over 25% of their current usage and they would still be using lots of water! Their bills will be in the region of £2,000 per year. That's getting on for 12 cubic metres per week.
Yorkshire Water
Did you know?
1 cubic metre is 1000 litres, which is around 12 baths full of water or 3,334 cups of tea!
No "average" household could be using that much, surely? Maybe Ofwat should be chasing down these profligates and leave the rest of us alone.