Thanks for the offer of help Pixpax, I'm going to try to get this working myself. I'm not on a deadline so it's good for me to try to solve it myself.

I'll have a look at Wing3D. I'm used to using Maya (when I was at work) and never bothered with any other texture editor.

I tried a Planar map and it did separate the front and the back but it still didn't apply properly. Maybe it's how I'm putting the texture on. I'm just plugging it straight onto the Diffuse_Color.