Yesterday, I noticed that despite me being stripped to a T shirt, in a
workshop type room I have, the thermostat that controls the winter
heating in that room, was ON..Ok it wasn't actually controlling anything
because that whole zone is switched off for the summer, but it seemed to
say that the temperature was a mere 16C.

Now in WINTER that room needs to be up around 20-22C for comfort..

Is it merely that the rain was puring down, and the humidity was
shockingly high?

It occurred to me that a dish of water in each room in winter, would
make the place SEEM warmer by dint of raising the humidity to the point
where sweating would not cool the skin so much.

On another pint, I need - and with energy prices where they are at - to
control my UFH a little more precisely.

Currently the master thermostat is inappropiately located in the
kitchen, where the AGA renders UFH almost uneccesasary. I want to use a
radio type remote thermostat to control the overall zone, located in the
living areas, and use the existing kitchen stat to control the kitchen
alone.

This requires some extra bits.

Firstly, what kind of radio stats are there? one with feed-forward
intelligence might be nice, but simple is OK too - I can do the rest by
adjusting the zone timing.

Secondly, the kitchen stat needs to shut off a couple of zone valves on
a Polyplumb manifold..these have a screw thread outer and a plunger that
shuts the flow down and which is rotated to balance the flow.

I am sure that these exist because the manifolds are designed to utilise
something, but and ordinary motorized valve it ain't and there is no way
to fit those.