Okay, so the nameplate is made up of two objects. This is so that I have to spend less time on UV mapping and can use smaller textures. I have done the same thing with the successfully working headboards that I have made previously - and other nameplates in the past - so that shouldn't be an issue.
This is the whole model.
This is the text on its own.
This is the plate on its own.
The way I built the plate is pretty simple:
1. Created a rectangle spline and correctly sized it as wanted, to make up the black part of the nameplate which the text actually goes onto.
2. Cloned said rectangle twice. The first one I kept the same, and the second one I increased the dimensions of slightly. These rectangles I then made into editable splines and attached to each other, to make up the gold outside part of the plate.
3. Extruded the first rectangle to create the black part of the plate.
4. Extruded the second spline to create the gold part of the plate.
5. Turned each one into an editable poly.
6. Created a new text spline, sized it correctly, set the font and typed the name in.
7. Extruded and positioned the spline correctly, ensuring the rear of it was not capped.
8. UV mapped both and saved their UV templates.
9. Made textures using the UV templates and applied them in the normal way. Set the textures both in the UV map and in new materials as I always do.
10. Exported to IGS format.
11. Created a new scenery blueprint using the quick function in BE2, then set the name and display category.
12. Exported into TS without issue.
13. Bosh... it's buggered!
What I shall now do is Andi's suggestion. I'll start by making a backup of the full thing (of course), then export the plate itself on its own and see what happens...