Assuming that this Sunday Worship is the programme to which MrH refers, it sounds to me like a difficult one for the sound engineer. Live broadcast, chapel acoustics, and an original sound source (the choir) which may have sacrificed some clarity of diction to enhanced musicality.
Seeing it came from Scotland I expected accent to be a problem for me (one of my blind spots I'm afraid) but that proved not to be the case. Like MrH I found some of the words hard to follow, though it was decidedly easier in the case of those hymns with which I was already familiar.
Never been to a latin mass myself. Anglicans mostly went in for English long ago, but I seem to remember it was in my lifetime that the RC's here were even permitted to do likewise, and that some clung to the older form for a long time. I certainly know a few who complain of the passing of the latin mass even now.