I thought they were earlier, but I found that R.P Weston & Bert Lee wrote screenplays for the British film industry in the 1930's - but I think their songwriting peaked earlier. They also wrote With Her Head Tucked Underneath Her Arm (1934) and Heaven Will Protect an Honest Girl (1933) and Knees Up, Mother Brown (1938), so maybe they were more recent than I thought..
-Joe Offer-