It's a fabulous place. The path up to the enclosure was called Pennyunk / Penyonke [Lane] back to the 1300s and likely long before[http://www.geograph.org.uk/photo/351089] as this seems to be a pre-English [i.e. Old Welsh] name [it doesn't make any sense in Old English but does in the language spoken in the Peak until the 7th/8th C]. Pennyunk would have meant something like 'headland of [the] youth' in Old Welsh [Pen = top, end, head, headland; Iouanc = youth, youngster]. It's possible that this was the pre-English, P-Celtic, name for the enclosure. After all, Penbroga [= 'land's end' = Pembroke] goes back to the Iron Age... Cf. the shape of the hill with another 'penn'; Pendle.