Mark Leishman talks about potential flag change with NZ flag expert

So the flag debate has polarised the nation and Mark Leishman had a chat with Malcolm Mulholland, one of the team charged with choosing the final four flags.
 
Malcolm is a senior researcher at Massey University and he’s written several books on New Zealand's history, including a history on the country's flag.
 
In this interview he explains how the four flags were chosen.