Exidia recisa, Amber Jelly.
This was seen today in Pembrey Country Park. It is a species found during the winter months, on Willows but you need to look at small branches at head-height. Although records suggest it is uncommon I think it might be found everywhere, particularly after some days of damp weather, on small branches of willow . During dry weather it dries to form an inconspicuous brown crust which revives after rain.