With a 5p. piece for scale, can anyone supply the precise species?
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I'm not sure what this is from, my best guess would be a skate or ray, but I am afraid that it is too square to be dogfish (Scyliorhinus canicula). They tend to be much longer than broad (as an estimate at least twice as long as broad). And as you say they have wee twizzly bits (technical term!) so that it can be attached to a handy anchor.
Lat/Lng: 50.82858, -0.22544
OS grid ref: TQ250047