The same "Seeds of Love" manuscript in Pegg's book, which Greg mentioned above, is also reproduced in facsimile in Karpeles' book (between pp. 4 and 5). Its key is A. However, the key is G, for the version in Cecil Sharp's Collection of English Folk Songs, edited by Maud Karpeles, vol. 1 (Oxford UP, 1974, No. 153-D), which says "Sung by John England at Hambridge, Somerset, September 1903." Was the manuscript written at that time and reproduced from Sharp's notebook?
~Masato