Thanks to all and the link. Out walking later I realised 'Foggy Dew' when I wasn't thinking about it, then wondered whether the melody might even predate 'Foggy Dew'.
Now I'll have to think where I got my 'Unquiet Grave' from decades ago.
They did indeed announce and sing 'I heard the voice of Jesus say' in the programme when I re-listened. Also I listened to Nic Jones Dives and Lazarus.