Thanks Granada and The Rev. I have been playing about for quite a while to learn how to get this working, so thought I would share my new found knowledge here and spare others the job of searching around for the non specific tutorials out there.
I'm fairly surprised not many have viewed it yet, perhaps it is something most don't care to try as it sounds complicated!
Hopefully over time people will find it useful though!
I'll take a look at that bump generator. I did try one before going the Gimp route but it seemed a little awkward, and not great for adjusting current maps, as opposed to making new ones.
What I really need though is a masterclass in unwrapping, as my attempts are always rather rubbish
I spent 6 or more hours yesterday making a bridge and uv mapping it. After much switching between gimp, fpsc and blender I ended up with a solid looking, but fairly naff textured bridge. Ah well lol.