We went for a bit of a trip yesterday up past Cwmorthin.
Walked up to Rhosydd, through 9 adit and up out the twll. We then walked past Moelwyn slate mine (having a quick look inside) up the Craigysgafn ridge, over and down Moelwyn Mawr and dropped trough Wysgan back to the car.
Took some going to find a way out of the twll.