Nick Brooks wrote:

My granparents' house in scotland got it's water supply from a stream
that ran through the garden. It collected in a small pool and then ran
down a pipe to a tank in their loft.

As children we walked upstream to "see where it came from". Finding a
dead sheep in the stream after a few miles put us off drinking water for
a while.


What was that figure about the number of times London tap water is
likely to have passed through someone before it reaches you?

--
Grunff