Went and had a look at Matt Eade's
Ridgway's Cackling Geese today at the Cuckmere and they were present with five
Barnacle/Cackler hybrids and nine
Barnacle Geese; the general opinion seems to be that they might be of Dutch origin. (I was grateful for the assistance and guidance of other birders as I hadn't been to that area before.) .
Hybrid and
Ridgway's Cackling Goose (centre):
Hybrid &
Ridgway's Cackling Goose (right), note tiny bill:
Barnacle Geese: