Hi
This is my understanding. the order will be under the Flood and Water Management Act 2010
http://www.legislation.gov.uk/ukpga/2010/29/section/36
List action that a water company can ban. (They can't just make up others)
(2)Only the following uses of water may be prohibited— .
(a)watering a garden using a hosepipe; .
(b)cleaning a private motor-vehicle using a hosepipe; .
(c)watering plants on domestic or other non-commercial premises using a hosepipe; .
(d)cleaning a private leisure boat using a hosepipe; .
(e)filling or maintaining a domestic swimming or paddling pool; .
(f)drawing water, using a hosepipe, for domestic recreational use; .
(g)filling or maintaining a domestic pond using a hosepipe; .
(h)filling or maintaining an ornamental fountain; .
(i)cleaning walls, or windows, of domestic premises using a hosepipe; .
(j)cleaning paths or patios using a hosepipe; .
(k)cleaning other artificial outdoor surfaces using a hosepipe. .
I can't see cooling wort in the list...so I would suggest that cooling wort is fine....