From: "Andrew Gabriel"
Subject: Central heating Q.
Date: 09 February 2005 23:42

If one end is a thermostatic radiator valve, then just turning
that off probably isn't good enough -- they don't usually have
an 'off' position, just a low or frost position. You need to
remove the thermostatic head and replace it with the blind cap
which comes with the valve, and will seal it off regardless of
the temperature.

Good advice. I took a radiator off, turned the TRV off (as I thought)
and went away for Christmas. Cold snap, TRV opens, new wood floor
flooded. Not a Happy New Year. :-(

Rob