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Thanks again for your help. I shall be off to Screwfix on Monday to swap the C17 for a C27!

Thanks for your prompt and helpful advice. My only concern before swapping the C17 for a C27 is that the latter is listed on the Screwfix website as a 5-wire installation yet I only have 4 wires! Can you shed any light on this please?

Advice wanted please. I have bought a new Horstmann Centaur C17 to replace an old Landis & Gyr RWB252 programmer but find the installation wiring diagrams unclear for a DIYer. The boiler is a Boulter Camray 5 pumped system. The old programmer connections are pictured here: Can anyone...