Quite a few peaks across the world attract the name "Sugar Loaf". The best known is perhaps the one in Rio de Janeiro, Brazil. Its shape is a quite good approximation of the shape of an old loaf of sugar i.e. rather like an artillery shell. The Sugar Loaf on the edge of the Brecon Beacons above Abergavenny, Wales, is a less spectacular example and one that doesn't accord too well with the sugar loaf's shape, resembling (from some angles) the flattened cone of a volcano. In fact it is not made of igneous rock but is a ridge of sedimentary Old Red Sandstone. My view is taken from an adjacent, slightly lower peak, The Skirrid, made of the same rock.
photo © T. Boughen Camera: Sony DSC-RX100