Boiler connected to the thermal store. Thermal store connected to the
rads.

Thermal store on thermostat and timer - so cylinder calling for heat
is the only control over the boiler (timer will probably be set to
either continuous, or off for holidays, or possibly a nightime quiet
patch). (and boiler controls pump and pump overrun)

But what control of the rads?

There will be two radiator circuits (open plan main area kitchen &
cloakroom wc, and bedrooms & bathrooms), and operated on "pump plan"
with a further pump on each circuit.

The building layout is unusual with no obvious place for room
thermostats, so I'm considering all rads fitted with TRV's, and the
timer for each circuit just controls the pump for that circuit (with
automatic bypass valves if all trv's are closed on that circuit).

This would mean the pump runs continuously during a heating "on"
period, but power consumption of a pump seems to be about a
lightbulb's worth.

From a user perspective, you have the hot water timer that needs to be
on whenever you want water or heating (and is best left on all the
time), two timers for each of the rad circuits, and no thermostats -
just trv's. I've seen a nice 4-channel timer that wraps the
functionality up into one neat little package.

(Other details that probably don't affect the overall picture - the
main open plan area is on two levels and also has a woodburner (so
main area trv's might be set to "off"), boiler is non-condensing oil-
fired.)

Advice, suggestions, feedback?