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Thanks both. I think we might go for the wired one as it can directly replace the old thermostat. I won't attempt it myself for sure though.

I'm a complete amateur so apologies in advance. Our oil fired CH and HW system is controlled by a 2 channel timer (Honeywell ST699 I think) in the airing cupboard upstairs and a room thermostat (Honeywell T6360B or similar) in the hall. I would like to replace these with a programmable...