Day says the design has everything people need to know about New Zealand with the stars for the Southern Cross, the silver fern, and the red and blue colours in keeping with the current national flag.
The day the Guardian visited, Day was flying his family crest, and that of his late wife Barbara Clarke. He was also flying the New Zealand sesquicentennial flag with the kōtuku (white heron) and the Hundertwasser one. Across the fence, his neighbour had chosen to fly the French flag from his 12-strong collection.
Day used to own the wool shop, The Wool Den.
His brother, Gregory, has lived in Ireland for the past 50 years and Day has a healthy sprinkling of flags from the Emerald Isle.