Start in pull-in (AA box no. 161) approx 25 yds east of and opposite Nantyffin Cider Mill Inn and east of A479 junction. Continue westbound on A40 to Brecon East roundabout (10.92 miles) encircle roundabout taking 4th exit to retrace outbound route on A40 to Bwlch ( 17.38 miles) continue on A40 to junction with A479 turn sharp left onto A479 to Tretower, Proceed on A479 north-west up a gradual climb through Cwmdu, Waun Fach to top of climb at Pengenfford (1084 ft). Continue downhill on A479 through a series of sharp bends for approximately 4 miles to Talgarth roundabout (31.5 miles).Encircle roundabout taking 4th exit to on A479 to start long climb through a series of bends to Pengenffordd. Continue on A479 on long descent through Cwmdu (take care), Tretower to Finish in small layby alongside double farm gate and 200 yards before junction with A40 at Nantyffin Cider Mill (41.75 miles)