Per Twitter: In St Erth, Cornwall on 09 Dec Roy Phillips found Swallows in a nest still being fed!
One Swallow over the Ashcott Corner old car park at 09:30 on 08 Dec was presumably the same bird that Garry had.
Swallow seen twice over Meare, near Glastonbury, this afternoon.
Presumably the same Swallow which has lingered throughout November is still at Hinkley Point, appears to be feeding adequately still.