The only version which approaches Peggy Seeger's own is that of June Tabor on her most recent cd . .Also - I'm glad to have the "written down during transatlantic phonecalls" story confirmed - I'd heard it before but only from less than authoritative sources.
However I think "Lovesong for Modern Times" was a sub-title - leastways that's how I recall it (in New City Songster, I believe).
G.