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Haha, yup, tado not tarp, have edited.
I thought the rads had to already have TDVs on them for them to be compatible. We're in a relatively newish house so hopefully everything will be standard fittings. Our last place was just a mix up and a total pain.
It's a bit like buying bike parts, iso Vs JSI, left hand threaded/RH threaded etc etc.
Explains why my parts box kept growing
PQR
NotThamesWater
You mean Tado?
Most smart thermostats come with a whole bunch of adapters.
Tado fit m28 x 1.5, which is the standard size of European lockshield valves
Our place didn't have standard ones though, so we used adapters for a while.
Until they turned out to be shit.
So we replaced all of the lockshield valves in the house over summer - this is a pain, but very doable.
To see what you have, you can unscrew the TRV (using the knurled bit there), and measure the threaded bit.