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Sorry, me again. Just for confirmation/a second opinion, this is next to the boiler. Looks like the thin black wire not connected is the one that terminates behind the tp5000. I just need to hook that up to the middle connector on the block (with the mains turned off as this isn't on its own...

No such luck, I'll see if I can find where the wires come out to the boiler, obviously being careful of opening up something I shouldn't as per your previous post about a gas safe engineer

Now you've confused me again, isn't the blue sleeve indicative of it already being neutral?

240v when connected grounded on the light switch, perfect. Got there eventually, thanks both for the pointers

I'm using a multimeter, I had the other terminal against the mounting bracket of a nearby radiator although that wasn't earthed itself so I'll try again with a light switch and report back!

The wire going to common is 119V and there is no voltage when tested on the brown sleeved wire. That doesn't seem correct....

Yes, there is a blue sleeved wire behind the wall along with an earth and your comment about the brown sleeve hogged my memory of changing multiple light fixtures and they all had these grey wires with brown sleeves for the live, electrician the wired the house must not have wanted to pay extra...

Thanks for the reply. So to clarify what I'd want to have done by a gas safe engineer, I'd need the BDR91 connecting to the boiler somewhere, probably in the cupboard container the boiler, and the Tp5000 will become defunct as there is no replacement for it in the evohome system?

I currently have a danfoss tp5000 at the bottom of three floors that controls the entire house. It's terribly inefficient and leaves most rooms freezing whilst one or 2 are unbearably hot so in looking at a smart TRV system and settled in the evohome. What is currently connected is the danfoss...