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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Birch Polypore?? Just looked through my book. Could it be this
You can add Birch Polypore as an identification by clicking on "Edit" and then scrolling down and entering "Birch Polypore" into the common name box. Clicking on "Get Recommended" should give you the scientific name. Then people can agree with you and build your reputation.
Did you get a look at the pores on the underside? If elongated and gill-like then it might be one of the Maze-gills, Daedalea quercina (oak) or Lenzites betulinus (birch). If you could identify the tree it would also help, and or say whether it was living or dead (although these do not always grow on their nominally host trees). I'm not exactly an expert but these do not look like Birch polypores to me. They tend to have a smoother, brown or tan upper surface, sometimes "crazed" and overall "saddle" shaped like a bicycle seat - See also Dryad's saddle. I agree with kieranc23. Try entering an ID and see if anyone agrees or enters an alternative. Good luck! Paul
Lat/Lng: 52.5331, -1.9501
OS grid ref: SP034928