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Just to update the thread, this question is now solved! Courtesy of the following link to a compatibility chart: http://www.heatweb.com/pdf/Invensys/Programmer%20Compatibility%20Chary.pdf So after a bit of research I went to B&Q and bought a Drayton Tempus 7 £49.99 and followed the wiring...

The clock dial on the timer has stopped turning properly, loses about 6 hours per day so I need to replace. I can buy a new Danfoss SET3M unit for £43 ish from ebay but i'd rather upgrade to a 7 day digital timer if possible. I've discovered that new units fit to a new standard backplate that...