Bitten the bullet and installed this in the house. 9 radiator valves, hot water control and a complete rewire of the heating system later it's finally up and running and very impressive.
connectedproducts.honeywelluk.com/evohome/
The craze of building a biggish house and then using one thermostat and TRVs to regulate the temperature is insane. This is the only way I could think of to zone the house without redecorating afterwards.
Pros? Very granular control, nice to have the bathroom warm only in the mornings and late evenings, and the lounge off during the day etc. Discovered that the original hot water stat on the tank actually controls at 65C, not the 50C on the dial (being an unvented cylinder the original stat has to stay in for protection).
Big screen in the hall telling you exactly what each room / zone is doing. Remote control via phone app. The wiring centre for the heating is now tidy and logically laid out (took the most time).
Cons? Expensive. You'd never recover the outlay in money saved, especially so if you paid for the installation which would take most of a day (well, it took me most of the day...). With an unvented cylinder you'll probably lose the immersion heater unless you have a separate pocket for the probe.
The wireless TRVs while not loud, are noticeable. Like a normal motorised valve but a bit quieter.
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Honeywell Evohome new
Honeywell Evohome new