++ on what Pictonroad said.
Dead easy to wash a bike with a buck and sponge etc. Given that so much rainwater has been collected for the garden then run some of it off into a bucket and wash the bike etc. If you are bithcing and moaning now about not having water out of a hose pipe then what will happen when you have to get it from a bowser at the end of the road, if it ever gets that bad.
It is a preventative measure designed to help ensure that they can keep the water flowing for all. Work with them and not against them.
Yeah I know I am not affected by it now but have been in the same situation previously. Deal with it and work with what you have got. Sods law that as soon as the ban came into place it rained. It did that before as well and will do again I am sure.