Adder????????
Dude, If I ever found an adder that big by me, I'd be wishing I'd brought a bigger snake hook.
OK, this one will have you. Brit species.
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Dogfish or some kind of ray? (no not that Ray!)
Cheers,
Tom
Probably the thornback ray (Raja clavata) then although the starry skate looks quite similar
Edit: thornback ray it is! The properties of your image were very helpful
Cheers,
Tom
Cant even see which way round it is