Lucius, you do guess correctly that I am on the right side of the puddle.The Archers is a long-running radio soap (50+ years); the Dambusters was a war film from the mid 1950s and the Dambusters March went to number 1 in the British charts; Jerusalem is a poem by William Blake set to music by CHH Parry, and often used as a hymn in Britain.
Most Britons of a certain age will be all too familiar with all three of those, but they will probably mean little to those brought up beyond the Septic Isle.
WassaiL! V