Had a pair of Barnacle Geese on our pond yesterday - wonderful sight to see them take off. Would they be on their way to or from somewhere at this time of the year? We're on Ashdown Forest in East Sussex.
Looking at google maps you are in between WWT London Centre and WWT Arundel
My Flickr photos
Realistically, assuming the i.d. is correct, these are extremely likely to be feral birds. Quite a lot of them in the WWT Slimbridge area, so could well be ones descended from those other WWT places Alan referred to.
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