Flock of about 500 birds heading west. Groups this big suggest the migration to breeding grounds has, or is about to, start.
No interactions present.
Groups of 100-200 have been passing over the York area, heading north, for a couple of weeks now...so certainly well on their way back home.
My Flickr photos...
Lat/Lng: 53.5043157, -3.0415889
OS grid ref: SD310013