(At around 30 mins) There is a reference to pounds and guineas. It may be helpful to all that "five guineas" meant, in 1937, five pounds plus five shillings (each guinea being a pound plus one shilling). Thus, the negotiations in that scene in the film were concluded with: "Five pounds" and "five bob for the missus." (A "bob" was the nickname for a shilling)
A witty comment it was, in context, notwithstanding that the concept of "the missus" is rather outdated nowadays! Pre-decimal currency remains complicated, even in the UK, in retrospect.