https://phys.org/news/2018-05-london.html

London is unlikely to experience such shortages this summer. It is the winter (not the summer) weather that determines whether or not the city runs out of water, and winter 2017/18 had plenty of rain. But what happens after a dry winter?

At Oxford's Environmental Change Institute, colleagues and I have addressed the question of how to prevent London from becoming the next Cape Town. Our research shows that if no action is taken the city is indeed set to experience more frequent and severe water shortages in the future. This is mainly down to population growth, but climate change complicates things further as it will mean more frequent and intense droughts.