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Looks more like Cylindroiulus caeruleocinctus - ie robust with bronzy colouration. A very abundant species in south-east England. Unfortunately the two diagnostic features that would decide which species - the head and the tail - are obscured/out of focus. Ho-hum...
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: 51.281709972222, 0.19799
OS grid ref: TQ533559