Thanks for those ideas. You were close Dawn with the radio programme.
I went through a box of my Mum's things and looked through an August 21, 1920 copy of "The Burton Observer" that she had saved. I'd thought it had been saved because of a group photo of about 300 children and a write-up that describes a picnic given by Burton's returned soldiers to the children of their fallen comrades. I've always assumed my mum and aunt were somewhere in that group.
However, there is also a 1/2 page section in the paper for the "Young Observers' Patriotic League" and it is conducted by Uncle Jack. It begins with a message to "My dear Nieces and Nephews" and contains prize competitions, projects (how to make a letter rack), puzzles, games, riddles, stories, birthday greetings etc. You could write to Uncle Jack at the Burton Observer and send him letters and snapshots. When you joined the League he would send you a membership card.
So now I'm thinking it was my Mum and Aunt that sent the photo to Uncle Jack and it was featured in one of the weekly Patriotic League sections.
There were 6 requirements to belong to the League:
To be plucky; To try to do right; To speak the truth; To be cheerful; To be kind to animals and; To be helpful. - Words we can still live by