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The comment on this Schneider video suggest that this is actually a common issue, and has to do with switches. As a sparky in training, I will have a look inside the housing tomorrow, too.

Apologies for bumping this thread, but it closely matches my issue in that I've bought the exact same replacement part from Screwfix (head only, £55) and changed the wires one by one, like for like, with almost everything is working bar the valve springing back after there is no call for heat...