> [England] While famously rainswept I think you mean stereotypically rainswept. 25m people, >40% of England, live around London where it actually doesn't rain very much at all. > The UK is one of the rainier places in Europe Yeah, that includes Wales, Scotland and NI, where it really does rain all the bloody time.
The rain that falls across the Thames basin has historically been distributed relatively evenly across months, compared to regions with monsoon seasons. That makes management easier.
I do expect supply to meet current demand. And afaics, it would, if the pipes didn't leak.