SILVEREYE, Zosterops Lateralis

This ones a bit sharper than the last one I put up which was in very murky conditions.This bird shows off the V in its tail well which I thought was a distinguishing feature in the Identification of a Finch - however in my research I could not find this to be true.  I wonder if anyone can tell me what the V in the tail means. Some birds do and some dont !!  
rgds poo