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It's the vertebrae of a dolphin or small whale, I really can not be any more accurate with an identification than that from the photos, the bone is too degraded.
What interests me is where you say you found it, is the Google map point accurate - it looks a long way inland? Were there other bones? Was it buried?
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Lat/Lng: 54.3563, -3.4058
OS grid ref: SD087965