Using Comfort to control heating system

["Ewen Cameron" <ewenjc@xxxxxxx>]

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We have been doing up a victorian house over the last 18 months and
as part of this we have install new central heating.  On the plumbers
advice we had thermostatic radiator valves on all but two radiators,
only one zone with a cental controller.  Having lived with it for
some months we realise it is not doing what we need.

Problems:
1) The thermostatic valves slow down as they get closer to the
required temperature.  The longer the heating is on the warmer the
house get.  2) During spring and autumn we need to reset the timer to
heat for a shorter time because even if the valves have switched off
the house still gradually heats up (heat off lagged pipes? and the
two rads without the valves).  3) Upstairs gets hot in the afternoon
sun, while downstairs can stay quite cool.

Solution:
I think I need at least two zones (upstairs and down) and an
overriding thermostat in each zone to switch the boiler or controller
off when it reaches temperature.

Should I fit conventional thermostats / T-valve for zones or should I
get Comfort to monitor temp and control the controller?  If using
Comfort is the way to go - has anyone done it and if so how?
-Ewen