I don't really want to be able to control everything from the moon or have some self optimising system (they can't even get a word processor to learn effectively). Rather, I'd just like to control some rooms independently of the whole system without going around the house opening and closing valves twice a day. I know I could/should zone the system but that will have to wait for some glorious future date.
Initially, it would seem most useful to be able to stop the living and dining rooms heating in the mornings when, at least during the week, they're never used. If it has any impact, I could take it further through the house.
So two questions:
Has anyone done this and had good or bad experiences? (I'm aware they can be noisy but they would be operating mostly when there's nobody in the room.)
What is a cost-effective solution? I can see Pegler i30 valves at various prices, down to the low 20-quid mark but some less branded alternatives have prices way below this (eg at 30 quid delivered for 3: http://www.conrad-electronic.co.uk/ce/en/product/1275959/Thermostat-head-kit-5-up-to-295-C-eQ-3?ref=list ).
Although I can't help thinking that if it's too good to be true, it probably is, I have 5 radiators between just these two rooms (19 in the whole house), so costs mount pretty quickly.
Any alternative suggestions chaps?