W,
Depending on your situation the banks may well be more than happy to lend you the money.
They are usually a bit more cautious when it comes to lending to support 'evaporating items' such as holidays, weddings and PPL training.
However if you have to borrow the money for a PPL and pay that back over the next 2 years, how do you intend to keep flying?
What I am trying to say is that is you have to borrow a relatively small amount of money to get there in the first place, are you sure you can afford the repayments AND the cost of the flying afterwards.
The cheapest short term borrowing at the moment is the 0% credit card thing for 6-9 months but beware that the APRs after this period are frightening.
Best bet would be to raise some extra capital by extending a mortgage.
Have fun
FD