Thanks Terryw nice concise answer. It is just a frustrating process at the moment.

Change my circumstances did. At the time pre (GFC) a fixed rate gave me the security to budget what money we had. It seemed every time I blinked the rate had moved north. The decision to fix was based on a presumption, "What if?" Never thought that it would happen but "What if?" did happen 6 months into the loan.  So be mindful, security has a place. There are no crystal balls nor guarantees in life but budgeting and planning can mitigate the fallout from such scenarios. 

Apologies for the ramble. 

What I want to avoid is cross securitisation. Using the equity in my PPOR to facilitate the purchasing costs and deposit for IP only and any other IP related expenses. Doesn't that help me at tax time? Keep the streams separate for accounting and taxation purposes.

I don't understand your comment,

 "You need to certainly open a separate facility against your PPOR but why are opening a line of credit and not a standard Variable or Fixed product?"

Could you elaborate further on this?

Thanks