An update of progress with this scene. Have added some of the objects built for the scene, some UV'ed some not, though not happy with the result so far.
Depending on where the objects are placed, will have an impact on how they look. Sometimes the object will be dark other times half will be. Not sure why this is. Have tried njeneb's suggestion of using individual light sources, but with mixed results. Might leave the objects out of this one till i get more experience using Terragen . I'm sure there is a solution, just haven't figured it out yet.