Strategy for tackling debts ?

I'm trying to get debt free and have cleared a few so far and now I'm down to the last few and I'm not sure the best way to tackle them.
The debts are £6500 loan that has around £4600 to pay.
£3500 loan for car finance.
£850 credit card.

I have a £1000 to put towards one of them right now and am able to save up a bit extra every week to continue paying more off than the standard monthly repayment but I was wondering would I be best trying to pay one off the fastest to get rid or be better off reducing the biggest one ?

I'm not to bothered about the credit card one right now as I'm just paying the minimum payment on a 0% interest rate and I'll transfer the amount to another 0% card when the 12 months are up.