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Thanks for the quick replies! Mick: Seems perfect, I've googled for that very pic so many times, but I've been looking at Y-plan, not W-plan. The only thing I knew was that mine wasn't S-plan! Seco: it's a Honeywell 3 port (but NOT mid position) valve, I now know it to be aka a "Divertor"...

Wups, I think the boiler is actually wired through the pump to avoid it firing if the pump breaks. Sorry, can't be bothered to fix the pic as it's not really important. ..or is it?! :?

Hi all, first post so be gentle ;) I removed a hideous old timing unit and replaced with a snazzy new (eBay) Drayton Tempus 7 allowing for the first time, independent control of hot water and central heating but I fear that I've made a boo boo in the wiring. I won't go into depth about what...