Many things happened during those two decades; the Great Depression, Prohibition, the rise of fascism in Europe, come immediately to mind. And millions of other things.
well that aint your choice luvy is it so find a book and stop depending on the computer you twits get over with it so shut your laptop or computer down noww! if you did not hear this then shut up and...
Yes, shillings were minted up to 1967. Because they were equivalent to 5 pence they continued to circulate alongside 5p coins until that denomination was reduced in diameter in the early 1990s.