I found this handsome brute of a beetle crawling through my train carriage this morning. You can just see First Capital Connect's lovely seat fabric on the right. At 30mm long and very heavily built, I imagine this Cockchafer (for that is what it is) would have scared the beejesus out of some commuters, but I coaxed it onto some paper so I could lift it up and get a good photo. Then I freed it through the window.
This next picture is a bit blurry but shows some key features rather well when seen in profile: the very fat body; the white sawtooth pattern peeking out from under the wing cases; the pointy pygidium; the antennae with fans of leaves.