Wagtail movement at Davidstow

I paid a visit to Davidstow on Thursday and stumbled on a decent movement of assorted wagtails.  I estimated around 300 Pied Wagtail with a few White Wagtail and at least three Yellow Wagtail. Two Northern Wheatear, 30 Ringed Plover and ten Dunlin added to the list but I couldn't connect with the Buff-breasted Sandpiper.