It's quite simple. There are many, many people, not just from south Wales but from the south-west of England, who are presently travelling to Heathrow to fly on long-haul flights. If they travel a shorter distance, their own carbon footprint is lower. So, it does make sense then to put people in a position where they're not driving so far, where they are not increasing their own carbon footprint by giving them the option of being able to fly closer to home.