Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Tremella mesenterica, the Yellow Brain Fungus, is mainly seen in winter, when it grows on fallen branches of deciduous trees. Yours looks like it's on tree debre. They like Birch, Ash and HazelI think your identification is correct. Looked on first nature website and the climate needs to be wet.
Lat/Lng: 51.6083, -4.2657
OS grid ref: SS432923
Near top of Llanmadoc Hill