Or to give it it's full title, the Mid Kent Water (Non-Essential Use) Drought Order 2006. Here it is:
http://www.opsi.gov.uk/si/si2006/uksi_20061424_en.pdf
And here's the main bit:
Quote:
2. The Company may prohibit or limit the use of water for any of the following purposes—
(a) the watering, by hosepipe, sprinkler or other similar apparatus, of—
- (i) gardens (other than market gardens), including lawns, verges and other landscaped areas,
- (ii) allotments,
- (iii) parks, or
- (iv) any natural or artificial surfaces used for sport or recreation, whether publicly or privately owned;
(b) the filling (whether wholly or partially) of privately owned swimming pools, other than—
- (i) pools designed to be used in the course of a programme of medical treatment;
- (ii) the filling of pools where necessary in the course of their construction;
(c) the filling (whether wholly or partially) of ornamental ponds other than fish ponds and wildlife garden ponds;
(d) the operation of mechanical vehicle washers, whether automatic or not;
(e) the washing of road vehicles, boats, railway rolling stock or aircraft for any reason other than safety or hygiene;
(f) the cleaning of the exterior of buildings, other than windows;
(g) the cleaning of windows by hosepipe, sprinkler or other similar apparatus;
(h) the cleaning of industrial premises or plant for any reason other than safety or hygiene;
(i) the operation of ornamental fountains or cascades, including those where water is
recycled; and
(j) the operation, in relation to any building or other premises, of any cistern which flushes
automatically, during any period when those premises are wholly or substantially
unoccupied.
I don't know how well this has been publicised over there but it explicitly allows the cleaning of road vehicles for safety or hygene purposes. Although you can't clean windows with a hose pipe. (So I guess you're allowed to use a hose pipe to clean the lights then?!

)
I thought I'd post this on here for people to discuss.
I wonder if it could be argued that you aren't allowed to clean your numberplates?