Whereabout is your cousin located?
I have a theory that says that there is a form of collusion between the insurers as the cheapest this year will generally be the dearest the next and so on until the cycle restarts. Thus each year I do my usual ring around or web check before I go to a mob called the Greenslip Kings and generally end up with something slightly cheaper that thee best quote I received (applies for car as well).
he is in wollongong, im not sure if he tried them but i have used them in the past and they are good.
