"Mike Clarke" wrote in message
news
You can still use water outdoors if you:

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Use tap water to fill a bucket or watering can
Use grey water, which is water thats been used before ie bath water
Have your own water supply such as a private borehole.

So it would seem that using grey water (eg bathwater) *is* allowed by
hosepipe. Which is sensible: if it was otherwise going to go down the drain,
it makes sense to reuse it for watering the garden.