How to experience this legend - Black cats and Fairies

This is a challenging route which takes about 5 hours with a distance of 8 miles/12.8 km. It is recommended that either the Landranger 160 or Explorer OL12 is used to navigate the route. Starting point is SO 025248, access from the west end of Brecon along Newgate Street, turning up along Ffrwdgrech road. At three fork roads, take the far left and follow road up to crossroads for 1.5 miles/2.4km. Travel ahead, over cattle grid with National Trust sign and continue up to car park, known locally as Cwm Gwdi car park. For map of the route and directions go to:
 

https://www.nationaltrust.org.uk/brecon-beacons/trails/cwm-llwch-horseshoe-walk