Into this post-Olympic, rain-drenched mid sum­mer, the tenth Green Man fes­ti­val burst into life. Nes­tled in the Black Moun­tains of mid Wales, Green Man’s are­na on Fri­day is a won­der to behold; still at this point a green and pleas­ant land with its beau­ti­ful­ly posi­tioned main Moun­tain Stage – a nat­ur­al amphithe­atre, with a con­ve­nient steep…