You must be stark raving mad to borrow money for a holiday. It is not an essential and it will cost you a lot of interest to repay it.
And you do not need a �15000 car. If you have to borrow money for a holiday you can't afford such an expensive car. It's common sense.
The financial market is very unstable at the moment, and interest rates could rocket. Make sure any loan is low interest at a fixed rate, so it can't go up. Why not forget the loans and when you have paid off your current loan, save for a car and holiday.