It seems to be two individuals attached to different sides of the same leaf on a shrub, about four feet above the ground.
No interactions present.
If you add a revised ID using Cornu asperum (current valid name) people should agree.
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: 51.4, -0.5
OS grid ref: TQ1071