With the able assistance of the Brisbane State Library at the Queensland Conservatorium I today tracked down a score arranged (?) by Ivor Gurney. Having read the forward to 'Ivor Gurney A Fourth Volume of Songs - Oxford University Press", it is not entirely clear to me whether Gurney has composed the melody or the score is merely his harmonisztion
What I do know is that I'll need to brush up on some music theory before I attempt to notate the tuplets and changes in time and key signatures and the means of enacting these in NWC or ABC.

Regards, John

PS I note that in Gurney's published works that he includes some other Yeats' works, including Salley Gardens. I must chase up some of the lesser known ones.