Even if you get the best grades, this won't guarantee a place for PhD. First of all, I recommend you to start looking at it a bit more positively. It is not "highly unlikely" for you to get a funded place. Funded places are limited, yes, but this doesn't mean you don't have a chance. My first degree was not good either but my Masters degree made up for it... with a good proposal I secured a few funded places to choose from. You can too. Focus on what you want and start working on a good proposal. Good luck (up)