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Thankyou for your reply everyone how would I go about testing which wire is which with regards to the black and white wire?

Hi guys. Recently moved into a new place. I have a baxi solo boiler, hot water tank in airing cupboard and tanks in the loft. Heating and hot water is controlled by a honeywell 9400c. There is a honeywell Hcw80 room temperature controller and then a HC60NG receiver in the airing cupboard...