MalcolmI copied A Fair Maid Walking from O'Shaughnessey's "21 Lincolnshire Folksongs collected by Percy Grainger" (or similar title - I'm at work, and can't check). I can't remember if there is a tempo given with the tune in the book.
I have noticed that in certain circumstances a Q: setting that produces acceptable results in Abc2Win, produces an extremely slow midi when converted by Abc2Midi. So it's then a case of increasing the Q: until the midi plays at the same speed as the original ABC - perhaps that's what happened here, and I never reset Q: to its original value before posting.
I'll let you know tonight when I get home.
Wassail! V