L1A2,
THAT's the version I recall from the late sixties and early seventies, thanks!
Many a time have I seen the engine start up sequence sung at the beginning, all participants pints in hand eagerly awaiting the cry of "fire on No.3" only to be rather surprised with such variants as; "fire in the starter" "the crew chiefs on fire" or similar, followed by everyone's beer heading that way.
Happy days long long ago...................................................