I actually complained to the head office of Shell and their response was it is only so that the cashier can confirm the bike rider is over 18. They said you can show your licence to confirm then they will turn the pumps on for you. I tried this and the cashier tried to have a right go at me till I gave them the middle finger. When I turned round there was a copper standing there and he just laughed it off. I think they are all on power trips.