Thanks for the suggestion, but unfortunately I want to affect only one object - probably having reflections/etc, which I’m fairly sure Edge Rendering wont do?
Hmmm. So I deleted the textures and re-did them, and it seems that unless I have my second text object (the outline, Font.001/Text.001) selected and in Edit Mode, my initial piece of text (the main colour, Font/Text) disappears.
I recieved an illustrator file with strokes around the numbers. So I exported the internal number as a SVG. Then I took the stroke, in illustrator, and expanded it out to become a real path. I exported that as SVG as well. I brought them into Blender and colorized them as needed.