"The maximum prison sentence the court can impose for causing death by dangerous driving or careless driving under the influence of drink or drugs is 14 years"
The guilty would knock some off, depending on when it was entered, to a maximum of one third.
http://www.bbc.co.uk/news/av/uk-england-cambridgeshire-43547472/richard-frost-double-fatal-117mph-driver-caught-on-cctv
WAC