Picture 2 is a cross-section, picture 3 (not well in focus) shows the underside.
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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That looks like a very diminutive example of a bracket. The upper surface does not seem to show the side-to-side annual growth rings that Ganoderma sp. usually have, but instead has top-to-bottom wrinkles. Perhaps the bracket is too young for growth rings to show? Could sub-zero temperatures have caused the wrinkles? However, the internal structure looks right for Ganoderma sp, so I'm a little confused! :)
Lat/Lng: 54.5, -6.4
OS grid ref: NW1620