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In 1964 Granada TV took the Jesuit maxim "Give me a child until he is seven and I will show you the man" as inspiration for a series which documented the lives of 14 seven year olds every seven years. Now they are 56.
When it was first broadcast, Seven Up! shocked many with its emphasis on class - but that is what made it such compelling viewing. For me, this first programme remains the most powerful - at the time, I had been teaching seven year olds in an east London primary school.