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Thanks for tips, ordered Honeywell CM927. Hopefully it'll be simply enough to install on existing backplate. Fortune favours the brave. Thanks again.

Hi all. Have a Vailant Combi in the loft, wired to a Potterton Miniminder ES timer and unbranded thermostat BOTH in the cupboard under the stairs. Want to replace both with a wireless thermostat and/or timer as currently the heating matches the temperature of the cupboard, which is not...