Just a very quick update today as I'm driving all over the place before work this morning. Even the tail end of rush hour on the m4 will be fun. For those of you who take the m4 in the mornings - don't panic! I'm not taking Buttercup, so there wont be any massive delays :p
As you can see from the images below I fixed some of the artifacts and coloured in my Cornel Box. It has a white light source very nearly in the centre. In the screenshot with reflections you can clearly see the colour bleeding (which is the desired effect). Next steps are to get the dimensions of the box correct and add some objects to it.