I think there may even be another agenda worth examining, one which has not been discussed, as far as I know. WWI was not the sudden explosion of political outrage often described, in the wake of Sarajevo, but ten years military posturing building Dreadnaughts, and more before that. There was a positive wave of jingoistic nationalism before that, which included The National Songbook and Arthur Quiller Couch's Oxford Book of English Verse, both of 1900. The Quiller Couch family were Establishment, and folklorists, and Arthur went on to start collecting the Oxford Book of Ballads immediately after. Were they active in the FSS too? See my drift? Cecil Sharp working to replace German folklore inherited from Prince Albert with English. What a glorious thing to be an English ploughboy, ploughing the fields of France...