A Large Bracket Fungus

Noticed that this diseased tree in the Serpentine Walk which has had its upper branches sawn off had a large bracket fungus growing from the side of the trunk.

 The underside was creamy-yellow.

It was too high up on the tree to see the upper side properly but I think that it's an example of Dryad's Saddle (Polyporus squamosus) so called because it looks like a seat for a dryad or wood-nymph..