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There is only one large (up to 25mm) British marine, but terrestrial isopod (isopods are typically flattened from above; amphipods from side to side) that looks like this. It is common, living in cracks, caves etc. So you can change your id to 'certain'.
Nice ID notes for us all Joc. - thanks.
The ID panel cannot be altered of course but it's fine as it is Hannah.
Lat/Lng: 52.0042, -5.0778
OS grid ref: SM888384