Which do you still have, the tent or the encyclopaedia?
We had the Children's Encyclopaedia, and a subscription to the Children's Newspaper, I think that was also produced by Arthur Mee. (We weren't allowed comics.)
I can't remember reading any articles in the newspaper but on the back page there were small ads for stamp collectors. You sent for 'approvals' - a little packet of stamps - and then paid for the ones you kept and sent the others back. We were always scrupulously honest. I've no idea what would have happened if we hadn't played by the rules.