Drawbacks: Once i attempted to go ahead and take shuttle to Ace at London Heathrow I was told there was a 5 pound charge for each person to ride the shuttle. This is unacceptable. I did not pick up the car. I rented from Sixt which was excellent Pros: Reservation http://cheap-cars-for-hire-west30617.suomiblog.com/top-cheap-cars-for-hire-vauxhall-secrets-11555372