In a patch of creeping thistles that was teeming with insects
No interactions present.
Not Large Skipper, and I think there's just enough orange on the left-hand antenna to suggest Small Skipper, but I can't be certain. Essex Skipper has been flying for at least a few days in Buckinghamshire.
Entomologist and biological recorder
I don't think this photo lets you tell, you need to see the underside of the antennae to split Small from Essex skipper.
I agree with this being a small skipper, however, I do admit it is a long time since I've worked in the South of England and seen Essex skippers. From my recollection the markings on Essex skippers cleaner and more distinct.
One thing I can say is this looks to be a male with the single dark line on the upperwing. This line is a row of special scent scales the male uses in courtship, known as a sex brand.
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I don't think you can tell from this photo - you really need to see the underside of the antennae to be sure. The essex skipper has really smart black tips, but only on the underside.
Lat/Lng: 52.1, 0.1
OS grid ref: TL4457