Some time back in 2018, i forget the exact date, but it was during a pleasant jaunt towards the Bwlch Y Riwgir, and following the famous wall towards Diffwys.
I can remember the vista from the trig point of Diffwys, was outstanding.
I may be wrong, but i think i could just pick out the summit of Plynlimon and beyond, one of views you do not forget in a hurry,