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I think this specimen is probably A.aquaticus, but John Bratton is correct to be wary of the pale colour. Proasellus meridianus (a common species in Britain, if people check specimens) is frequently mis-identified as A.aquaticus because the dark gut can show through the pale patch on the head to give the appearence of two pale areas separated by a central darkly pigmented patch.
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
Interesting. Thank you. We will try to get a clearer photograph next time.
Lat/Lng: 53.757648011, -0.4376019859
OS grid ref: TA031301