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This looks like a Hygomia species. H.cinctella has a very sharp keel, which is not that obvious in your specimen. However, it does not look like H. limbata, which has a 'normal' rounded keel. I tend to favour H. cinctella (which is quite common here around Oxford).
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
I agree with this - it seems to be spreading fast, and I saw it in West Yorks a few years back.
Lat/Lng: 53.2227, -4.1643
OS grid ref: SH556717