If you are planning to take out a loan secured against your parents house, would it not be cheaper for them to increase there mortgage to cover the antisapated cost.
I am probably being to simplistic, but I would expect the cost of an increase in the first mortgage to be cheaper than a second charge mortgage.
This would then give you much more choice on selecting your Flight Training provider.
I have no reason to critise OAA. (they are probably very good), But it seems a bit unfortunate to have to select a FTO on the basis of funding.
As an aside; I thought Cabair, FTE and CTC all did a broadly similar funding package
Fran