I suspect this will not be doable from a photograph but any thoughts on the mould growing on the brackets (which I think were Beefsteak Fungus)
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
University of Edinburgh and Biodiversity Observatory (OU)
Thanks for the ID but is Inonotus hispidus not the name of the bracket. I was looking here for name of the mold.
Lat/Lng: 51.540316447216, -0.32921433448792
OS grid ref: TQ159837