Thames Water customers - Temporary Use Ban in effect from 24 August 2022
Its press release this morning says that,
"Domestic customers should not use hosepipes for cleaning cars, watering gardens or allotments, filling paddling pools and swimming pools and cleaning windows" and
"While the TUB does not cover businesses, Thames Water is asking businesses across its area to be mindful of the drought and to use water wisely, for example, by not washing commercial vehicles or turning off water features on their properties."
None of those restrictions is expressed in mandatory terms and there's no mention of fines or penalties, so it's not clear what sanctions (if any) any breach may attract.
https://www.thameswater.co.uk/about-us/newsroom/latest-news/2022/aug/thames-water-hosepipe-ban-2022