The Y Service: The Ears of Bletchley Park The Y Service was Britain's listening arm: thousands of operators copying enemy Morse, forbidden to interpret it, passing the take exactly as heard to Bletchley Park. This guide explains the discipline of faithful copying. Quick facts Role interception Operators many young women Rule copy all, judge none Customer Bletchley Park Special skill knowing the fist Y Service operators were the war's model of disciplined attention, and most kept its secrets for fifty years. Their transcripts fed the most famous codebreaking in history - which fed, in part, on their refusal to guess. Free tool and guides: Morse Code Works Morse Code Works - free Morse code tools and guides. Reference chart