This beetle didn't hang around; it was on the tip of a blade of grass, which is hidden behind it, hence the appearance of levitation!
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I'm pretty sure this is the result of a parasitic fungus (something very like it affects hymenopterans too). The fungus infiltrates the brain, and affects the insect's behaviour, making it climb to the highest point it can and latch on, just before it dies. Why? Because it's the best place to release spores from.
Ain't nature wonderful?
Lat/Lng: 52.255705, -0.239274
OS grid ref: TL202634