mushroom found in surrey garden

[lordofzombies]

http://lordofzombies.net/2012-10-04%2011.31.13.jpg

http://lordofzombies.net/2012-10-04%2011.30.43.jpg
sorry pictures were too big.
Habitat: Grass, although the area used to be wasteland covered in stinging nettles until the summer, partially covered by a tree, very shaded.

Gills: gills are kind of brown

Stem: very thin, nothing on it.

Cap: Brown to yellow, looks like a sea shell

Location: Banstead, Surrey.

[Davie Crockett]

It looks like a Hares Foot ink cap. If the edges start to dissolve then that's the clincher.