dfspilot, I am a mortgage adviser.
And as for taking out a personal loan, this would probably be a more viable option, particualrly with the CU as they are often more 'sympathetic' than the banks. You can expect to pay a higher interest rate though and the loan will be repayable over a shorter term than if you remortgaged. Also, bear in mind that if your parents act as guarantors they may have restricted access to their savings.;
I still think that this is probably your best shot and when you get a job you can always remortgage or top up your existing mortgage to repay the CU loan if you wish to do so.