Hey,
I have a primitive car that doesn't have an AUX cord in it and i listen to CD's in the car.
Anyway, I really love all the radio 1 essential mixes, which go for about 2 hours each. How can i split up the mix so i can fit it on two cd's as the maximum capacity of a cd is about 1hour 20 mins??
I.e is there a way to split the mix into different parts to put on different cd's?

http://audacity.sourceforge.net/ should be more than enough for what you want to do. Find a good spot to break it up, select, copy, paste, save. I recommend you use a lossless format (FLAC, AAC, WAV, etc.), since that will reduce any hit to sound quality, and the greater filesize shouldn't be a problem if you're chucking it on a CD anyway.

Thanks, does FLAC work on a cd? because i know iTunes doesn't support it?

If you're writing it as an audio disk, the file doesn't matter beyond whether you're burning software supports it (it converts the file into something else* as part of the process of creating the audio disk).

*In simple terms.