Ok so over the last few hours I've been in battle with my Astute, and finally I took another look at the DDS file of my texture an what do you know....
Eleven layers stopped the image from showing and so I deleted 10 of them and this is the result.
The texture is quite nice in my opinion, thank you to Jhapprich for offering to help with it and please don't hesitate to offer again
Now with the texture in place and the sub looking very well indeed I'm left with a few more problems, First is the fact that when I turn either hard to starboard or the other direction, the Astute begins a slow but constant dive, I'm still unaware of what's causing such an action but if anyone can help me find a solution that would be great.