Roddy Doyle didn't grow up poor. He was a middle class teacher in a school of a working class area of Dublin for years and picked up on the Colloquialisms his students used in the classroom. He based most of his novels around the theme of 'god love them, they're poor but sure aren't they great craic (Irish for fun) altogether'. I thought it was a bizarre decision to have him write the foreword and just a cynical move to push more sales as Doyle is quite big in Europe but he'll always just be a cartoonist to me.