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Thank you - that brings up three things!Assuimng this is a 3-port valve, (did we confirm that explictly?) this is true only if the last demand was for water, which would leave the valve idle in the spring refurn (B) position if the last demand was for heating the valve will be parked in the A position with the motor energised and the lever will be free to move. Briefly demanding hot water only, should release it back to the B position.
1 - you are right, he said he had one zone valve but we don't know for sure it's a 3 port.
2 - when I said "everything off" in my head that meant the fused spur to the boiler and associated control wiring but I should have been clearer.
3 - it's somewhat ironic that I even mentioned this behaviour of last call for heating without considering the system could still be powered....
Some photo's will hopefully add some clarity in due course.