"Set Square" wrote in message
...

Then let me remind you of what the OP said in the initial post, namely:

"The conservatory rad needs to be controlled separately from the rest of
the
houses' CH as I may need heat in the conservatory during periods when the
main house stat is not demanding heat and the boiler is therefore
inactive."

He clearly therefore needs to be able to heat *just* the conservatory
without heating *any* part of the house at the same time.

No he actually states that the stat in the rest of the house will be off so
he gets no heat from the boiler.
Adding a second stat gets around this.
The OP may well be happy to turn the stat and TRV on and off.


I rest my case!

Shame as you didn't read what you quoted.