Umbrella shape, white but getting darker towards the middle. Long dark grey stem, probably Mycena sp. Perhaps milking or bleeding bonnet.
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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It looks like a Mycena but you need much more information.Does it bleed when the stem is broken? If so what colour is the juice. Does the cap peel? And so on.
Lat/Lng: 53.525738565076, -2.2442185876571
OS grid ref: SD839032
50 year old wood, mainly beech and birch at this end.