After a bit of googling I think I have identified the fungi from Sheldon Wood.
I think it is Auricularia auricula-judae, known as the Jew's ear, jelly ear or by a number of other common names, is a species of edible Auriculariales fungus found worldwide. The fruiting body is distinguished by its noticeably ear-like shape and brown colouration; it grows on living and dead wood, mainly elder but also on beech and sycamore.
Its specific epithet is derived from the belief that Judas Iscariot hanged himself from an elder tree; the common name "Judas's ear" eventually became "Jew's ear", while today "jelly ear" or other names are sometimes used.
It is meant to be edible but I don't think I'd chance eating fungi that hadn't been identified by an expert.