I've recently hooked up an LG Flatron M2262D via a 15 pin vga cable to my pc.
It's an old unit still running XP, but with a dual core processor.
Visuals are great, but I've got no audio (unless I plug my headphones into the tower).
I've played around with the audio menu on the tv, but still can't find a solution.
Am I just being a muppet, or do I need an additional audio connection from the pc to the tv ?
If so, what type of cable do I require ?

The 15 pin connector supplies video only, you will need a 3.5mm stereo jack to whatever the screen has on the back for audio (typically 3.5mm jack or 2x phono sockets).