An Isopod? found on the rocky shore
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Is that not Pac-Man?! Lost a bit of his lustre since the 80's parhaps... ;)
There is an uncanny resemblance!
Isopod indeed - how big? Have a look at speckled sea louse http://www.marlin.ac.uk/speciesfullreview.php?speciesID=3322
The magic of nature is all around us - we just need to learn how to see it.
Luckily Ispot produces more serious answers!
The isopod was about 10-12mm when uncurled. It could be the speckled sea louse, where it was found there was very little sand.
Pics of speckled sea louse here http://www.lalows.blogspot.co.uk/2011/08/why-is-beach-wet-because-sea-we...
Are they close to what your Pacman thingy is?
Lat/Lng: 50.21163, -3.70118
OS grid ref: SX787360