Here is yet another mention of the line, along with mention of the lore that "tuck" was originally said by a radio announcer by way of censorship.
(I did a parody of the poem as well beginning "They raised me well, my mum and dad," which was printed with the results of Speccie 3140, but I didn't mention any sweetshop. I kept "coastal shelf" since I thought, and still think, it doesn't imply gloom but simply deepening.)