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Thanks for all the input. I know there are other, possibly better, products out there. I also know British Gas will install a Hive. However I would prefer to DIY it, if I can get a definitive walk through of the connections.

I am intending to replace my ailing Horstmann C27 heating and hot water controller with a Hive. As will be apparent from the following I am not a sparky! However I do enjoy a safe fiddle for DIY satisfaction (and cost saving). Hence my queries: My present controller Horstmann backplate is...