I reckon if you're a builder/developer or speculator , then you'll need your loans separate and flexible . For that , I assume you'll pay a premium. E.g. Higher interest rate and multiple fees .
Mine is cross collatoralised however I'm a long termer so I'm more interested in the best deal costs wise. It does have some flexibility and ultimately I could refinance with someone else if I needed to . Only trouble with refinancing is the revaluing costs and the mortgage discharge fees . Has to be worthwhile to change lenders .
Not sure about the high income line of credit thing ? You can still pay a normal loan down quickly if you need to .
