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Thanks for the offer - but the whole thing was modernised a while back.

Raden I thought that the 3022 were extinct - if you do have one it could be the simplest and easiest answer in the short term. Chris R Thanks for your illuminating reply and the diagrams. I can confirm that I am stuck with the old 4404 so would need to change/modify it to get the...

Having just moved into my new house it appears that the parting shot of the previous occupiers was to leave us a knackered central heating timer. Fortunately (?) it was a Randall type 3022 and I happen to have a spare Danfoss 4033. Although they both have similar backing plates that will allow...