london olympics 2012 colours

A client has asked for some olympic themed banner design. As I'm sure everyone's aware the olympic rings/logo are out of the question to use as they are licence protected to the hilt.

Can we use the colours of the five rings? If so does anyone have the cmyk breakdown of the rings' colours.

This info seems to be suspiciously absent from the web?...

any help/pointers appreciated

thanks rowley, may i ask what site you got it from? was it official colours?

thanks