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Just received an email from Westherm and they have confirmed it is M30 1.5mm, hence I can fit a Wiser Radiator Thermo without an adapter. The Westherm 6 is also sold by B&Q and Tradepoint under a Regis brand, so I think the Westherm 6 is unusual in their range, since they must have just put...

Yes, I think I have Westherm 6. Measuring is difficult, since there isn't a lot between 30mm and 28mm. The inside ring is just 30mm and the outside just over. See photos. Annoyingly I think I have to buy adapters.

That's my problem. I don't know what I have. Do I have M30 1.5mm or something different?

Can I fit the Wiser Radiator Thermostats to these TRV valves? I think Wiser require M30 1.5mm valves and I suspect I have Comap M28 1.5mm type. I think I have Westherm 6 TRV's, but I am not sure. Do I need the following adapters? I hope not given the extra cost...

Excellent! Just done that and it has worked thanks! Makes sense since the thermostat is effectively connecting the red and yellow when it gets cold! Cheers!

I have purchased a Drayton Wiser 1 to replace my existing Drayton LP811 programmer with a wired thermostat. I have an Alpha CD25C combi boiler single system. I am confused by the installation instructions, since it initially just says: "If there is an existing wired thermostat connected via...