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Platyarthrus hoffmannseggi(i)
The naming is a bit of a problem with various sources using the double trailing "i" and others single. I suspect that Brandt published the name with the double ~ii and that later authors grammatically corrected this to a single ~i, but I have not been able to find the original paper from 1833 to verify this.
Update: Here it is :o)
https://biodiversitylibrary.org/page/45989310
Indeed Hoffmannseggii - so I will change to that and also discuss this with some of the site maintainers that still use hoffmannseggi.
''Platyarthrus hoffmannseggii'' is a species of woodlouse which is closely associated with ants' nests, particularly those of ''Lasius flavus'', ''Lasius niger'' and species of ''Myrmica'', where it feeds on ant droppings or mildew. It is white, 4 millimetres long, and has a distinctive oval shape and short antennae. Its distribution appears to follow those of the ants with which it lives, and the British Isles are the north-westerly limit of its range. Elsewhere, ''P. hoffmannseggii'' extends south.. more
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And of course there are albinos of the "normal" woodlice (but these are quite rare).
You will fairly readily find this here species if you turn rocks or decaying wood in the field and stumble on an ants' nest. Not always, but often enough, but you will need to take a close look every time as they are quite small (the "wood" in the image below is a thin toothpick) and there is all sorts of other "white" moving around in such a nest as the ants will scurry to recue their larvae and pupae ...