Vaillant VRC 470F Controller + VR 21 - DCF77 or not?

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I have had the above full kit installed for a while now and there is mention of the VR21 outdoor sensor unit including the facility to receive time/date from DCF77 in Hamburg. I have seen nothing on the display which suggests it is receiving from DCF77, nor did it move its time by one hour when we went to BST, though I have it set to self adjust.

It did seem to move the clock back an hour around two weeks before it was due.

So how can I be sure it should or should not receive DCF77? The handbook gives no clues at all.
 
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