Miles, if you have a solid colour it might be doable by wet sanding, which basically means filling the chips with paint, letting it harden then sanding with very very fine wet and dry (with lots of water) I would not attempt it on my own car, but a professional would be able to help you out. It then gets polished up, and you would never know.
If it a clear coated metallic, its a respray only. There is a Road Rash repair from the states, but I never trust these wonder cures!
http://www.drcolorchip.com/
[video=youtube;a3RYHBdh9Xo]http://www.youtube.com/watch?v=a3RYHBdh9Xo[/video]