Water and wastewater charges, am i paying too much , (hope this is in the right section)

[cyberknight]

FIL just got a big refund as he was overpaying as the water company had fitted a meter outside the house unbeknown to him as he was paying based on rateable value of the house .
Im lucky i live in a low rate house and do not have a meter as i have 2 teens who sometimes have a bath an a shower each every day .

 

[Dave7]

@Pat "5mph"

UPDATE.
Apparently our charges are set by United Utilies.
They base the charges on council tax Bands ie house values.
Those values are based on 1991 valuations**
In our Close the 1st 5 houses are ex RAF officers houses. The next group of houses are newer and smaller.
Ours is Band C
The newer ones,are Band B (B is lower value than C).

I agree that although older our 5 houses will generally be higher value than the rest.
A Martin Lewis forum says I can appeal but am very unlikely to be successful.