BillE, that version you heard in Cornwall looks very like the one from Hampshire mentioned by Gwilym Davies (Tradsinger) in this thread Lyr Req: Holmfirth Anthem.

George Gardiner collected several versions of the song in Hampshire, but the only one which has been published is from Daniel Wigg, of Preston Candover collected in July 1907. Gardiner noted both words and music, but the text only is given as 'Twas Through the Groves in James Reeves, The Everlasting Circle, (London, Heinemann, 1960.) p. 165.