Did the replacement yesterday.
The red live and yellow switched live are definitely correctly identified. Neutral and earth both taped out of harm's way in case they're needed again. I'd forgotten how much of a PITA mains cable with a single solid wire conductor was to connect in confined spaces and considerable sweariness was involved.
Other problem was getting the b***** thing mounted to the wall; plasterboard dot glued to breeze block. Although the backplate was same size/shape as the old one it's mountings were a mirror image. One fixing was OK with a plasterboard Rawlplug. The other was too close where the cable emerged from the wall and the plasterboard crumbled. In the end it was solvedwith an extra long screw and a Rawlplug in the blockwork.
Had to use that technique before for heavy stuff but not a plastic switch fitting!!
All working now but as it's been warmer the last few days the heating's off again.
Meanwhile SO energy seem to have remotely kicked my smart gas meter into action and it's now registering gas on the in home display.
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