The following link describes a driver jalied for 6 yrs and banned for 10yrs for killing a pedestrian. In my opinion, this is the longest punishment for this type of crime I have seen. I do wonder whether it will survive a review.
http://news.bbc.co.uk/1/hi/scotland/edinburgh_and_east/8392687.stm
http://news.bbc.co.uk/1/hi/scotland/edinburgh_and_east/8392687.stm