I have followed that car on autotrader, it seems to follow the car supermarket type model of reducing by £100 each week it doesn't sell?
The plaque is easily located on the inside just below the drivers door mirror.
Red CS do seem quite rare. I bought mine on the basis that if I missed it, I could take ages looking for one!
I am not actively looking to sell, but would always consider a strong offer on my Red/black, 3 door CS, DCC, buckets, 19" wheels, <8k miles.