In the 1970s, children's book publisher Ladybird published a short book called How Computers Work. According to employees of said publisher the Ministry of Defence at the time ordered 50 copies of that book, asking for it to be bound specially in a plain cover, so that their students would not know it was a Ladybird book they were learning from. Today the MoD says they have no record of this book as it does not appear in their "books" department but it may have been a training manual, apparantely, in which case it would be classified. So there you go eh, the Ministry of Defence's knowledge of computers stems from a kids book. Which could explain a lot.