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Thanks everybody for the replies. Super helpful of you both. I made a quick check with a meter again just to be sure, and I have the following: 1= 240v switching from the programmer ch on/off (brown wire) 2= not connected 3= switched 240v when the stat led is on (call for heat) (black wire...

Thanks Whitespirit, Sounds like the Drayton will pretty much do anything that can be asked from it then! The Horstmann is really super basic, I'm thinking your right and half the switching it is doing is because of its mounting location, and the rest is analogue control that's simulating TPI...

Dear all, I'm looking for a bit of unbiased advise on choosing a new thermostat for my house, and wondered if you guys could give me some opinions pls before I bite the bullet? I have a smallish 3bed semi that is 3 yrs old with fully trv'd rads with a Potterton SL12 boiler, Horstmann...