The second autocode was developed for the Mark 1 by R. A. Brooker in 1954 and was called the "Mark 1 Autocode".
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Slightly different dialects of Mercury Autocode were implemented for the Ferranti Atlas (distinct from the later Atlas Autocode) and the ICT 1300 and 1900 range.
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Brooker also developed an autocode for the Ferranti Mercury in the 1950s in conjunction with the University of Manchester.
Atlas Autocode's second-greatest claim to fame (after being the progenitor of Imp and EMAS) was that it had many of the features of the original "Compiler Compiler".