What a fantastic show. I can remember watching it as a child, and it holds water all these years later. It's a simple show with a simple premise and structure, and all the better for it. Story, jokes, song. And also quite a clever idea of setting it in a post office, as it gives a rationale for the jokes that have been sent in. And the songs are quite catchy as well, I keep finding myself bursting into the Mike the Milkman song!