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The neck of this swan is certainly straight enough for a Whooper (or Bewicks) in my opinion, and the photo could just have been taken as the bird looked down.
Compare with google images of Whooper Swans: http://www.google.co.uk/images?rlz=1C1GGGE_enGB398GB398&q=whooper+swan&u...
Many of these images show strongly curved necks, with the head angled down.
Lat/Lng: 50.7739, -2.4045
OS grid ref: SY715972