I used to work for a water company and can't remember one instance where they removed one after the 12 months so am afraid you might be stuck with it
however 43 quid a month does seem high for your circumstances, check that your meter readings are actual reads and not estimated for starters, if they are estimated then provide actual readings, if you have an outside meter under a manhole cover and cant access it they have to send someone out to you to read it
if the bill is correct check for the following
dripping taps, they waste ALOT of water so if you have any replace the washers, get a hippo bag for the loo (or put a house brick in there) vastly reduces the amount of water used to flush.
save your washing up and do one big batch instead of 2 or 3 a day and never leave the tap running when you brush teeth
all simple things but they do work, I used to be on a meter and my water bill went down to 12 quid a month when I did all those

(had a 3 year old boy at the time with all the associated grubbyness, toilet mishaps to clean up after and extra clothes washing as they seem to be dirt magnets!)
pm me if you need any other help as I still have pals who work there and they might have other suggestions
