Around 12mm long.
Looks like a water beetle, but was some distance (at least 400 meters) from water.
No interactions present.
It is a water beetle - and some are very active flyers, not needing to be in water. Don't know which one though :-(
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
Thats usefuL and not Dytiscus as first thought
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Supporting FEET Conservation & Biodiversity Recording
Lat/Lng: 51.522, -1.136
OS grid ref: SU600806