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chez_jay-
Yes, I had a think about that and realised that realistically that isn't going to happen in the short term. None of the existing valves are TRVs so it would involve replacing them and most have very short runs straight out of the wall like this which I can picture being pretty fiddly
The second hand Netatmo was cheap and easy so if I do get round to doing it all properly I won't have lost much once I sell it on.
aggi
I ended up going with Netatmo here. I knew the installation would work with only the switch wires and no power at the point where the old thermostat was.
I picked up one second hand for about £50 and installed it in ten minutes so outlay and effort were minimal.