Try different branches. Each branch has it's own rules etc. and can be different from the same bank just up the road.
I know it's a lot harder to get PSLs for flying training these days, but it's not impossible!
If you walk in and ask for 70k then you are in for a hard time, but say you need 15k for a CPL and FI rating then you are in much better territory. Excellent job prospects (shortage of instructors) less financial risk for them etc.
You have to give and take with the banks quite often and give them an incentive. Usually this is of the form of 'I can afford to pay you back if I fail at flying because...'
Banks are hard cases to crack, but it can be done.
Bri