When I lived in London, I recall there was a fairly complicated distribution system designed to maximize gravity flow. Living near Hampstead, the highest elevation in Greater London, we reportedly got water by aqueduct from some 60 miles northwest in the Chiltern Hills, which was fairly mineralized. Water from the London Aquifer was, I think, distributed to areas where it could be fed by gravity. And Thames water pumped uphill only where this was the only option. Just my recollection, and this was 30 years ago, but a reminder of the caveat that you never know just what a brewery's source water is just by its location on a map. And "Thames" in the name of the utility designates service area more than guarantees the source. Like "Thames Television."