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Can confirm all has gone well with the replacement. Made the change live and heating is now controlled via Alexa with schedules tested and setup. Direct replacement of L722 with wiser 2 channel controller. Currently £99 at Screwfix...

Thanks for that. I may link out the stat and put the wireless one in its place then.

Hi, Am I right in thinking that I can straight swap a wiser 2 channel controller for the current LP722? Well leaving the current thermostat connected have any effect? The wiring diagram seems to be the same and other documents say the backplate is 'industry standard'