I have added a new photo to help with ID
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It's difficult to count legs pairs since it's twisted, thus revised ID not entered (some-one may be more brave than me?).
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
and thank you for your comment :)
It depends on the species - c. 35 up to 101.
The added image has about 75 legs pairs and head possibly longer than broad, which suggests Geophilus electricus - but its a microscope job to be certain.
Lat/Lng: 52.6, -1.2
OS grid ref: SK5604