They will be putting all water meters in all homes soon, so will all being paying for what we use. I am in Greenwich and our borough was the first. They come and dig up outside your house, not giving a care and during that, they break the pipe that is on your property, that is then your responsibility., so basically it is a way to get everyone to update the pipe work, that they can then profit from. I would also question whether you have a leak. Turn everything off and check the meter isn't running. We had an investigation, Thames Water could not find anything, sit in the kitchen, hear hissing, pull up floorboards and we have a swimming pool. Lost all the kitchen flooring, took ages.
To reduce the usage, you can get a hippo, that goes in the toilet, so uses half the amount ish. You can install a different shower head, that does the same, by spraying out less, also a similar thing on your tap.
Make sure the meter is to your property, by running a tap and seeing if meter goes round and stops when u turn it off. This happened to my brother, next door had a lovely green garden, watered everyday. My brother lived alone. Wasn't until he was in hospital for a month and the bill remained the same, that he queried it and it was spotted. Also make sure you have not got a shared supply and so they are charging you for next door also (happened to us). In which case you would stay on rateable water charges.
Other than that, just be mindful of your use age. Wait til you have a full load of washing, washing up, get a timer for the shower, no taps running washing your teeth. Clothes aren't dirty after one wash, only wash when dirty etc. Get a water butt for the garden.
Good luck