With a stipe (not a bracket), not Dryad's Saddle, pores on the underside.
No identification made yet.
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Have you a photo of the underside?
I took one but, unfortunately, it was completely washed out :( For what would you be looking?
The size of the pores mainly. I think this might just be Polyporus tuberaster which should have quite large pores.
Off the top of my head, I would say less than 1mm. They didn't appear particularly large. Looks like I should go back!
Lat/Lng: 51.093, -0.987
OS grid ref: SU710331