Hi Graeme, welcome to CDF
To burn your edited mp3 files to an audio CD, I would recommend the small, free software Burrrn - just drag your files into the Burrrn window, and burn.
Nero can also do this if you select the “Audio CD” template, but if you have Nero 7, there’s a problem where you’ll end up with skipping audio (you don’t say which version of Nero you’re using).
So, two choices there. Even though I have Nero 8, I still use Burrrn for it’s simplicity.