The standard Lancaster III was powered by a Packard-built Merlin 28s, 38s or 224s (V-1650-1) with a single stage, 2-speed supercharger. I think the only Lancaster with two-stage superchargers were Mk. VI with (RR) Merlin 85s or 87s. These were covered in some detail in a previous thread - I recall that there was much detail of individial a/c in this thread, including squadron allocations and fates. However it is probably more likely that the German witness was referring to an aircraft with 2-speed engines.
David D
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