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Impossible to agree, I think, because of the angle and the silhouetted effect.
My Flickr photos...
Looking at the full-sized image, the jizz certainly suggests Marsh Harrier, but not a readily identifiable photo.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Breadth of wings and long tail suggest a Harrier but cant be certain.
Its certainly a harrier of some sorts, and the shape suggests marsh harrier as noted by jeremey and neil above.
The location makes marsh harrier the most likely harrier to occur.
In all probability, it *is* a marsh harrier.
Got a full crop as well by the looks of it.
Lat/Lng: 52.312, 0.2945
OS grid ref: TL565706