:-) Rev!

If Bill S's water comes from the Thames area then his locality may be part of the Artesian Basin under London. If this is so then I doubt anyone would be able to drill into it at will. But I could be wrong.

Here on Oz some people, in previous droughts, drilled bore holes in their gardens but there were a lot of rules. In the last drought most of these dried up anyway.

Capturing rain and grey water is effective for garden watering, though probably not too good for drinking, especially off city roofs.

No problems now though. We have had a very nicely rainy May-- though Will the Pug and Wallace the fluffy cat hate getting wet. I suspect that's because rain is really unusual for them. They are both 11 and the drought lasted 10 years!