black insect with many legs
No interactions present.
It's far too slender and tapered at each end to be Cy.londinensis (which is rare!). Tachypodoiulus niger more likely, but can't see enough detail to make an ID (so I won't!).
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: 55.315531, -1.724757
OS grid ref: NU175024
On concrete wall of footpath underpass under A1