Wow, that took me back over 60 years. It was great being a kid in those days. I ate cereals for my breakfast, dinner and supper to get those freebies. As soon as a new packet was bought I was rooting through the contents for the free gift or cutting the box up .
The frogmen that went up and down in the lemonade bottle, the submarine that submerged and surfaced using baking soda. I had a wall full of animal heads from the back of Cornflake packets, Shreddies Treasure Maps, Shredded Wheat Moon Rovers, the Rice Krispies Haunted House and luminous ghosts.
I remember sending for a 'Stanley Gibbons' stamp collectors set advertised in one of my comics, 1/- it was, it had a stamp album, magnifying glass, tweezers, trays to soak stamps in for whatever, a bag of mixed stamps and two books of colourful stamps from all over the world. I took them all out and stuck them in the album then got fed up with it and swapped them for something. A while later my mother asked me about it as she had a letter saying quite a bit of money was owing. Well I didn't know what approvals were. She wrote back and said it was their own fault for sending them to a child.