Large fungus at base of ash tree - earlier photographed showed size in relation to rucksack
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Well, it's going saggy like Dryad's Saddle does, but I wouldn't like to say it's that, because it's so late in the year for them, and I can't see the underside.
I say it was Dryad's Saddle but we would need to see the undersurface. Polypores are quite long lived - and end up being an interesting host for other groups of fungi as they decay.
Following on from this I've added a pic of Dryad's Saddle found today showing the underside characteristics too - see http://ispot.org.uk/node/11135. Although this is often a spring fungi, I've found it also occurs pretty regularly in autumn and can hang around for quite a while (the linked observation was fresh about a month ago). As with many fungi, very difficult to give an unequivocal identification from a picture alone.
Two views of parts of the underside of the fungus have been added.
Lat/Lng: 51.9, -2.1
OS grid ref: SO9728