As I am aware, DEFRA issues the drought orders.
Drought orders have replaced hosepipe bans, yet the media still calls them hosepipe bans.
ALL WFPers are exempt from the ban/order as the ruling states you cannot fill a recepticle with "tap water", WFPers don't fill receptcles with tap water as we filter this before it reaches the recepticle.
so in short, if you use DI or RO water you ARE exempt. here endeth the lesson.