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I don't think the little crest between the antennae is narrow enough for nasatum.
Because I didn't mention that my grand-daughter found this woodlouse. She is a handy spotter, at the age of six. SO: WELL SPOTTED, ERIN WALKER!
I'm confident this is Armadillidium vulgare on the character John Bratton has mentioned, plus the slightly broader build of vulgare and I have never seen nasatum with a colour pattern like this.
Lat/Lng: 51.95765372803, -0.25604825019832
OS grid ref: TL199302