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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I'm not sure this is Postia. It looks wrong to me in both shape and colour. How did you conclude this was the correct ID? What was it growing on?
I would agree that it looks wrong for Postia. Piptoporus betulinus seems a better choice but other photos would help.
Thanks for your comments. I wasn't certain so from the feedback I guess my ID was incorrect. I simply referred to a basic Field Guide so perhaps should have investigated further. The fungus was growing on a rotting tree stump in a wooded area on the edge of moorland in the Yorkshire Dales.
Lat/Lng: 54.0, -1.8
OS grid ref: SE1365