Marmite is from NZ, Vegemite from OZ.
So, a redefinition of British food, please.
That simply is not true (about Marmite anyway). There were two factories in the UK making Marmite before it started to be distributed in NZ. Production of the Kiwi version of Marmite only started in the 1930s.
I remember Peter Stringfellow having a similar idea about oysters.
Have made a mental note to take Marmite with me to the Hilton brunch. Any bird who likes oysters with Marmite in them is a dead cert to swallow!