I have ordered the book. Interesting Blog. I think all of the ballads there that are related to Child ballads the greatest likelihood is that the Scandinavian stories inspired the British ballads they correspond with, particularly 'Per Tysson's Daughters in Vange' and 'Babylon'. Okay there are obvious differences but the similarities go far beyond co-incidence. Even the ballad that links to Lord Thomas and Fair Eleanor, the first British appearance is the English 17th century broadside. I'd bet that it is based on the Scandinavian story. The Scottish version is simply a rewrite of the broadside.