Winter Polypore

I'm sticking my neck out on the identity, as I've not seen Winter Polypore Polyporus brumalis before.
Photographed 3rd May.

It is reminiscent of Black-foot Polypore, with a "fat foot", rather than a black one.

Growing on rotting birch branches near the Shackleton Monument, the stone pillar above Midgehole Car Park at Hardcastle Crags.