I actually own a semi-completed book of Green Shield stamps. It's somewhere in the flat - possibly in a file box somewhere in the attic along with the other tat I've collected over the years. (A WHSmith paper bag from the 70s, the receipt for the VHS of 'Revenge of the Cybermen', a 'Dalek Death Ray' wrapper and jar of Schwartz mixed herbs with a 'use by' date sometime in 1987.)
Maybe I should've put the book in the knife drawer in the kitchen. That's where my mum kept ours back in the day... 
If you've enjoyed this piece of tat, then please seek assistance from a specialist in the field of psychology... or you could buy me a coffee via my Ko-fi account. The link is here.
And don't forget to get help.
