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is too big for an adder, and there is no sign of the zig-zag pattern that is usually visible in the slough of that species.
Not sure if you are in smooth snake territory there, but again I'd say it's too big.
Add Grass Snake as a revision (click on "Get recommended" for the systematic name), and others can agree (or not!)
We have grass snakes in our garden and, having found almost exactly the same in our garden (both size and appearance) I would agree that this looks the most likely.
I agree size and shape of the scales look grass snake. Put up an identification of grass snake and I'll agree to it.
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