Dead by pond. Seems segmented.
No interactions present.
The pattern does rather look like that, doesn't it?
I briefly hoped that you'd been fooled by one of their defence mechanisms, which is to "play possum". But the fly in attendance suggests the worst.
The are often mistaken for adders, or killed just on the general principle that they are snakes.
Lat/Lng: 51.4, -0.7
OS grid ref: SU9577