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There are others.
Tado works well though - although it's worth swapping out your valves if you don't have M30x1.5 fittings - with the best will in the world, plastic adapters are shit.
Wickes have them for under £10
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Netatmo have them (and they're meant to be simple to install if replacing existing thermostatic valves) https://shop.netatmo.com/gbp_en/#energy
£50 a time (and that's with a black Friday discount) just seems too expensive though. My flat's not that big and I'd still be looking at £300-400 to do all the radiators. I just can't see it being worth it at the moment.
Electrocuted myself installing our Tado. Think it’s step 5 of the instructions.