Unsure what type of fungus this was. There were two large clumps close together, comprised of many individual fungi, with what appeared to be smooth surfaces. The second clump is shown in the third image. They were sighted on the side of a cut down Cork Oak. Another clump with slightly different colouring is covered by previous sighting 4573878. Thanks to Barbara for the initial sighting.
This (and the related sightings) may show partly dried examples of a species of Exidia or Tremella (and some, not sure if all, brown Tremellas have been shifted to Phaeotremella).