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Thanks very much to both of you for help, will get multimeter out tomorrow but quick test looks like not getting 240V at live.

I was going to tidy it all up once working – second time I have wired it all up. Any idea why boiler won't fire up?

OK this better ... and yes 1 room stat, not done anything with that yet, but tried with it turned up and down. Was going to remove once nest working properly

Thanks really appreciate this ... posted a pic of Honeywell too.

Thanks Muggles, I have connected exactly as you said and everything setup (wifi, connected, account etc) but boiler not firing up and won't work on manual either. If I put Honeywell back works again. I do have a cable 1 into Honeywell but nothing on 2 – is that right? Any thoughts?

Can anyone help me with the wiring - replacing my Honeywell T45 with the Heatlink for a Nest 3rd gen? Does the common need a jumper from the live? Many thanks for any help, see attached pics

Hi Sturmillar, did you manage to work it out as I have exactly the same problem? My existing Honeywell has same connections as yours and trying to install a nest. Thanks