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What makes you think that this is from an adder? I'm not saying that I disagree, I'm just wondering because I wouldn't know if it was an adder or a grass snake. I know that sometimes you can see the characteristic zig-zag pattern still on the skin, but I can't seem to see it on this one. Am I just being blind or is there something else I'm missing here?
Not a great photo but it does have zigzagging.
Looking at the location, it is difficult to see what the habitat is...is it more suitable for one species or the other?
It does look like an Adder skin, but the patterning is not clear. I don't see Grass Snakes where I am, so I don't know their skins: someone who does will probably confirm this one way or the other straight away.
My Flickr photos...
It was in an area known to be a good place for adders.
Grass snake skins have keeled dorsal scales, and these can usually be seen on the slough. Also, although shedding distorts the skin somewhat, the generally short, rather stout shape is very much that of an adder.
Lat/Lng: 51.8, -2.7
OS grid ref: SO5316