The road from Glynneath to Ystradfellte will be partially closed from 9 to 13 Dec, 0930 to 1530 (between the two points https://w3w.co/inflating.sweeper.instructs and https://w3w.co/famines.willpower.sticks). This will prevent access to Clun Gwyn and the Nedd Fechan caves; and will affect access to Porth yr Ogof for those travelling from Glynneath (who will need to divert via the Heads of the Valleys Road and Penderyn).