Moving quite fast but not whirling.
No interactions present.
Looks more like a Heteropterous Bug to me? But I can't do bugs to save my life, so will bow to superior knowledge.........
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
Thanks for the ID's. I had got locked into a possible parallel with whirligig beetles.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707