No, it's definitely ' A Sigh on the Harp'. The title is taken from The Gododdin, the poem about the Battle of Catraeth quoted in the episode - 'There was blood on hair and a sigh on the harp', is the line.

I am the Simon above who made the current recordings from the Australian broadcast. I do want to make it clear though that the set floating about with the 26 titled episodes is the one that I have been supplying to people who seem to have found it via this thread largely. There are some episodes recorded by another listener in Ireland (which are in stereo/simulated stereo, as true stereo was not used in the early 70s for this show) but mine was the only full set located so far. I must however correct the post above - there isn't a third set from R4 in stereo - that report was of another person with a set of my recordings, which are tape captures from AM mono ABC RN (the Australian equivalent to Radio 4) broadcasting nationwide some time in the late 80s (I can't remember when it was exactly but I was still at high school so approx 1984-1988). The recordings aren't bad and reasonably clear but are definitely not stereo. (At the time in Australia I seem to remember that ABC RN were not broadcasting on the FM band unlike their sister station ABC FM, which was the same as BBC Radio 3)