my sister had a call from the local water company, we will be changing you to a smart water meter next week, my sister responded that they wouldnt as their water supply teed off somewhere under the house and fed the neighbour, they agreed on the phone that in this situation they could not fit one, and they would amend the work order.
the following week she came home from shopping and found the meter had been fitted anyway,and there was a big argument with the water company about it, who eventually, several weeks later came round and removed the meter. she has since had an extension built, and as part of the work she asked her builder to install a second pipe alongside the first, so that if it became necessary the neighbours supply could be split from hers (though that will involve digging up her kitchen floor to get to the joint.)