With the above words, the Earl Marshal threatened errant BBC cameramen should they step out of line during rehearsals at Westminster Abbey for the 1953 Coronation. Covering the event was the biggest challenge yet for broadcasters, cameramen and technicians in the still fledgeling world of BBC television. Paul Heiney paints a picture of the youthful service with the help of archive recordings, written records, and new interviews with Peter Dimmock , producer of the BBC's coverage, and with Sylvia Peters , its presenter. Producer Andrew Green The day that changed our lives: page 32