Really sorry to hear this, not what you need in an already stressfull time. I too am sceptical as to why they are waiting so long to fill a container....surely a well established company would be shipping multiple containers from the UK to Perth over this period? If I were you I'd take this further. Are your belongings safe or gone missing and they're stalling you? Do they have a legal obligation to complete the shipment within a certain (maximum) timescale?
My wife and I are shipping our stuff from UK to Brisbane in July and are just starting to gather quotes and recommendations. We too are looking at a shared container as not bringing that much but this has worried me a bit as what we are bringing is pretty valuable (mountain bikes, my work tools etc...). I really hope everything turns out for the best and would be interested to know what the end result is.
I notice the name of the company has been blanked out...are we not allowed to mention names of shipping companies to avoid or recommend?