Thanks Joe! I got it from another school song book I have
English Folk-Songs for Schools Collected and Arranged by S. Baring Gould M.A. and Cecil J Sharp BA Curwen Edition 1920

I'd forgotten what a nice song it is, but also remember singing it at school. It's amazing what we were allowed to sing at school - I'm sure some of the content of this book would not be permissible today for all sorts of reasons!!!