Yarrell’s Blenny (Chirolophis Ascanii)
This unusual looking critter is easily identified as a Yarrell's Blenny because of it's distinctive pair of branched tentacles above the eyes. They're generally 10-15cm long and can be found in rock crevices all around the British coast.
In case you're wondering, I found this particular one at the NAFC Marine Centre in Shetland.
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Image #132