Anglo, The Long Harvest wasn't entirely Child ballads, although you're right. I'm a Rover was included as a version of No 248. Also, Here's a Health to all True Lovers and The Lover in the Night were included for the same reason.

However, the series also included The Brewer's Daughter, The Lowlands of Holland (as an appendix to one of the Child ballads. Can't remember which.), Froggie Went a'Courting and the Wife of Kelso.