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David, any clues to microsite - was it in the soil clod, among grass, under log, etc? A clear shot of the back end would help.
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Lat/Lng: 51.6, -1.2
OS grid ref: SU6189