On Fri, 2 Mar 2012 16:30:46 +0000, wrote:

I'm not at all convinced about the thermostatic valve at the other end -
in fact I've knocked it a couple of times and provoked a squirt of
water.

Wait until the room cools down a bit and the valve opens properly.
B-)

Thermosatic valves are supplied with a maintenace cap. You remove the
thermosatic head and screw the cap down in its place this closes the
valve properly.

For a permenant fix you need to properly cap the pipes. Compression
stop ends would be the easiest by reusing the nut and olive from the
old valves. Best would be soldered stop ends.

--
Cheers
Dave.