If fitting nicely into the arconym is the main qualification Dave, I would suggest forming a tade equivalent of the military alliance I magined a while ago when commenting on western military interventions. Consisting of France, United Kingdom and USA I called it the FUKUS axis.
However if the aim is an Anglophone trade bloc, while UK, Canada and Australia are logical partners, New Zealand is an economic irrelevance.
And while a mutuallly beneficial trade treaty with the USA would consolidate that bloc the American's have a habit of trying to become the dominant partner in any agreement they enter. So to me, in the long term India would make a less disruptive trading partner although parts of its vast population withh always lag behind other English speaking nations.