On horse dung.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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I love this photo, but I presume the colour balance is wrong and they were more grey than blue??
Yes, they were greyish - I was tempted to tweak the colour balance but decided to leave it.
It is certainly a Coprinus but there are lots of species that grow on dung and most require the use of a microscope and a good key.
Lat/Lng: 50.6, -1.5
OS grid ref: SZ4084