Grey, spiky looking at the edge, about 6cm long.
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I think this is a Dab - our smallest and commonest flatfish. The curved lateral line (I think I can see this behind the head!) distinguishes it from very similar species such as Flounder.
Thank you. It's always good to know what things are.
Lat/Lng: 54.0, -2.9
OS grid ref: SD4163