8 mile circular from Ponsticill Res over Cefn yr Ystrad, Brecon Beacons today. Disappointed to see so much litter: discarded agricultural waste (air filters, oil bottles etc) in Cwm Criban and what I presume is lockdown rubbish on the slopes down through Taf Fechan Forest and on the path adjacent to the res on the return route. Such a shame about the graffiti and the domestic waste dumped at Cwar yr Ystrad quarry too. People seriously grind my gears!!