As for the twelfth slot, I should like to keep it open, to be filled one day by one of my children or grand-children. One good candidate is ‘Alien Adventure’, by Lawrence Eagar, aged 9. It is full of gems such as “They disposed of the alien space-craft merrily”, and “‘What th . . . th . . . ?’ he pondered, surprised.” But no doubt there will be many more to choose from.