These are the only two photographs that I managed to get, before it dissappeared. Large ant like insect about 15mm to 18mm long [body].
No interactions present.
I should have included the info that it is indeed an ant.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
You are probably right about the size exaggeration, as I was looking at it through a lens and it disappeared before I could see it life size.
Lat/Lng: 50.71996, -1.85071
OS grid ref: SZ106911