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Thanks. It all went swimmingly for some reason, TRV pins were alright. And apparently Toolstation is now out of stock on the 4-pack Smart TRVs so they sent me 4, not 8... (Had to order a 3-pack from amazon, which is fine)
The programmer install part took about an hour, luckily the wiring diagram was spot-on with our old Honeywell (just the wires were swapped L-R, and bottom-up entry...) I resisted the urge to install the device upside-down and installed it slightly on top of the old "hole". I now have a third-covered 1-gang-sized hole (single core cables come from there, construction vibes) on which I will get and cut a blanking plate to fit, tomorrow.
TRV install was a bit faffy to begin with but got the hang of it after the first two.
Not to be off topic: Home Assistant immediately detected both the cloudy-Tado and the Homekit-tado, setup was easy. Didn't like the Tado UI but it'll do I guess. Still have to convince my SO to install the app.
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disq
The pin-headed(?) adjustable valves that had existing dumb TRVs fitted required some extensive percussive maintenance and plusgas prior to fitting the tado TRVs (just to get everything moving smoothly again). Fitting a new adjustable valve in my office took very little time and cost ~£80 (from memory).