Mark - thanks!
Susan - sorry sorry, found it when I put in 'godspeed' as one word! And I might have spelt it plough, being an English song...
Mike - My mug (so it's a bit different from yours maybe?)had, I think, the first & last verses as in DT. Perhaps the other half-remembered bits came from hanging about with morris people when it probably was a drinking version as in the other thread which has coincidentaly popped up about this/these song/s.
Richard - Thoroughly agree.

Introduced French friends to the tune Speed the Plough (nothing to do with this song except for the velocity of the same agricultural implement!) - they couldn't understand the title so I wrote it down. It's since been known as 'Speed the Plug'...

Jo