No interactions present.
Very long legs and three dark stripes is typical.
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
My son has seen several of these and this was the smallest at about 7cm. He reports a peculiar scuttling gait and, having looked the species up, I think this definitely confirms your identification especially as the Channel Islands seems to be its base in the British Isles.
Lat/Lng: 49.2364, -2.0471
OS grid ref: S^966261