I got a 3rd for my first degree. My supervisor thought that was a bit unfair and took me for a masters. I am doing very well on the course right now and Im likely to get a distinction. The problem is I have to apply for a phd for next year. My refernces are good and funding is not a problem. Should I apply now or wait until september when I have a definite mark to show?
That kind of depends on the subject and what you're planning on doing next year. Some subjects fill all of their studentships before easter, so if you want a place you'll have to apply now, unless you're thinking of taking a year out.
Start looking now. Funding yourself makes finding a supervisor a lot easier, but many will be concerned that you have a third (even with a good masters). Talk to one of your current tutors who works in the same sort of area you wish to do a PhD in. They will be able to advise you which labs are worth looking at. Academics are more likely to consider you if the reference comes from somebody they know.