That looked so promising. Plugged in the new unit after wiring the backplate and no power to it. Tried reconnecting the Sangamo and that didn't work at all either. Traced it to a blown 3 amp fuse in the airing cupboard. Now back to the faulty Sangamo with no timer but at least can switch heating...
I did a search and found another similar post but it's just not quite close enough for me to understand.
I have bought a Drayton LP522 to replace a Sangamo 410 heating and hot water timer. I looked at the guidance to say which wires that are currently connected on the Sangamo should go to...