AKA Razor strop fungus
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 tree look suspiciously like a conifer (Hemlock maybe) but it is almost certainly NOT a Birch. This is a forestry commission plantation, trees are all same species.
I can not, however, offer an alternative :-/
All given ID's are subject to error/ommissions. Please seek independent verification before acting on ANY advice given. BE SAFE =)
I have to agree that it does not look like birch but the upper surface of the bracket looks a good fit for Piptoporus
I agree with you it certainly looks good for piptoporus but the tree is leaving me perplexed :-/
Lat/Lng: 51.5888, -3.1311
OS grid ref: ST217883