I wouldn't bother! It may be possible, but if it is it's going to be very expensive & you'll end up with something much worse than a stand-alone sat-nav.
Yes it can. But it's a crap system! Speak to your local dealer or Peugeot UK. I was working for a Peugeot dealer up until a couple of months ago, we were in the process of having one retro-fitted to a customers car.