The printed versions in the Bodley Ballad library are mostly Sylvie. I didn't see one there with Sovay (Maybe I just didn't find it).

What did Carthy mean by time signature 1/1? Surely that would be identical logically to 2/2 and 4/4, i.e. one semibreve/whole note to a bar. Did he mean 1/4? From recollection, it seems like 4/4 with maybe an odd bar of something else thrown in.