Scaley, grey, multiple legs.
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I have had a lok at the type of wood louse you have said and I can now see where I went wrong.
I had an infestation of these in my house. Fortunately they do not eat through wood nor carry disease so there are far worse things that could infest a house. I found loads of what I thought were dead ones under the stairs but then I read that they shed their exoskeleton! A relative of the shrimp family, they don't like central heating.
Lat/Lng: 53.555555288734, -2.279577255249
OS grid ref: SD815065