Ok, so finally some decent weather. Spent all day yesterday, wheels off, painting the rusted disk hubs, and then put one calliper decal on after removing the faceplate. Went on a treat, looked really good, right up until offering it back up to the calliper and the colour difference is just too far off.
I was always concerned this would be the case, and just wanted the GTi lettering, so I removed it and may look to see if you could cut the lettering out and use it that way.