On Jul 2, 2:25*am, "John Rowland"
wrote:
I was at the Embankment in Putney tonight, and I noticed that the incoming
tide was bringing a lot of foam. Where does it come from?

Incidentally, a police boat went up the river at about 11pm with siren
blaring, despite the fact that there were no other boats moving and no
possible benefit.of using the siren. Idiots.

At that time it wouldn't be easy to see if anyone or anything was in
the water, but I wonder in general what the siren might be for, given
that you can't nip out of the way very quickly on water.