Marios if correct as far as a factory fitted item is concerned. There is possibly another way - the car runs on CANBUS, and it is therefore possible to retrofit an aftermarket kit. I was quoted around £700 which seems a little steep. I plan to investigate further at some point.
IMO, it's worth £700. Long distance driving can be a real PITA without cruise as the Italian driving position can be tortuous on the right ankle. I'm really glad I fitted it to my spyder.