All, thanks for your help.
We looked closely at the mirror finish splash backs. We took a large sample home, cooked with it in the background and it was patently obvious they require more maintenance to keep clean. It would even show up fingerprints. So, despite the fact that the midnight blue mirror looked sensational, practicality won over good looks.
The colour we have chosen is a sort of gold/platinum pearl finish. Its not too different to Ferric Sheen in colur - a little more subtle in its colour - a bit more platinum and a little less bronze. The colour changes with light and angle.
At the moment I only know the number of the colour and not the name of it. If I get the name of the colour I will update this post.
Thanks everyone.