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Thanks for your reply. The engineer replaced a piece (Danfoss Randall HPA2 2 port valve actuator) - is this what you were referring to? The issue still happens with the boiler coming on when the Nest is all off (eco temp, hot water off, even restarted and reset Nest!)

I have a Vaillant EcoTech Plus 624 boiler (conventional, not combi) that keeps turning itself on and off during the night (I can hear it), and has continued today. It cycles between: Flashing timer and solid radiator: Just solid radiator: Just flashing radiator: Back to flashing timer and...