Look! I found another early edition of this little-regarded Puffin classic - printed under their now-defunct Mockingjay imprint.
I don't know now whether I AM commenting on how much young adult fiction has changed. In all honesty I can totally imagine a book like The Hunger Games being published back the 60s. Children's fiction has a long history of subversion, and it's really only in more recent year it's come to be as relatively closely monitored and censored.
It doesn't stop the Secret Garden/Hunger Games contrast being amusing to me, of course. I realised I'd missed the Mockingjay/Puffin trick on the first go so amended it: