Can't see the video on my laptop unfortunately , but thanks for posting anyway!
Florence, the silver fern leaf (one of our national symbols) was introduced into the RNZAF's RAF style roundels in 1956 (same time as you guys starting painting 'roos on yours I think). They were replaced in 1970 with the now familiar Kiwis after RAF personnel joked that our aircraft carried 'white feathers' - a symbol of cowardice or surrender!