So the Pink-footed Goose I saw yesterday near Martin Mere with the white neck band was controlled on 29 March 2011 at Vest Stadil Fjord in Denmark. This is presumably a Svalbard bird that normally winters in Denmark, whereas the Lancashire wintering population comprises of Icelandic birds.
He is in this flock of Pink-footed Geese (near the front, right of centre). Blow it up a bit (below) and you can just see his white collar.
Thanks to Fred Cotaar of the Goose Specialist Group in Holland for the info.