Having looked through the first rough edit there are a few areas in which we can bulk up the piece, including
HOLIDAY PUSH ALLOTMENTS
HOW DOES YOUR GARDEN GROW?
DOING THEIR BIT
In order to find these archives clips I went through the British Universities Film & Video Council and found this forwarded me onto British Pathe
Doing Their Bit. (1939) UK British Pathe
Transition for the opening (find tutorial)