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Boiler/ programmer connection

Many thanks for reply. Had a quick look at Hive site but wasn't very specific. Currently (and for simplicity to keep the system running) I have disgarded the C27 and fitted an old original Worcester clockwork programmer (2 on, 2off) which completes the circuit. Unfortunately the old...

I have a Worcester Danesmoor 20/25 non-condensing oil boiler (manf. date 1984!) still performing well apart from the programmer (HW & CH). The original mechanical programmer failed many years ago which I replaced with a Horstmann C27 digital module (5 wires) which has now also failed. First...