In message , Basil Jet
writes

Incidentally, I just found a picture of the River Tyburn flowing through the
basement of Gray's Antiques :
http://upload.wikimedia.org/wikipedi...ivertyburn.JPG

Although it's widely described as the Tyburn, this is actually a little
tributary stream that rises from a nearby spring (hence its cleanliness)
and is the brook that gave its name to Brook Street. It must join the
actual course of the Tyburn close by, but the latter is really a sewer
that wouldn't support goldfish and that you wouldn't running through
your basement:

http://farm1.static.flickr.com/133/3...8e6d8c14_o.jpg

Incidentally, just the other side of Oxford Street (beneath Stratford
Place) lies London's oldest reservoir - a stone water store, built in
1216, from which the waters of the Tyburn supplied the Great Conduit
which ran through to Cheapside, to supply fresh water to the city. Like
the Roman Bath in North Audley Street (also fed by the Tyburn), it is
part of London that has disappeared into the foundations and sewers of
the modern city.

--
Paul Terry