It sounds like the wee howff above Gleann an t-Slugain on the way up to the coires of Beinn a'Bhuird. I guess the true Beinn a' Bhuird howff is the one that we knew as the Smith-Winram bivouac at the entrance to Coire nan Clach below the North top of Beinn a'Bhuird. Both offer reasonable shelter for an overnight stay.
Must try to remember to listen out for this broadcast.