The name is taken from the sky in a painting featured in the movie. The movie Vanilla Sky is a remake of the Spanish movie Abre los Ojos (Open Your Eyes) which is a really good movie.
If you use your own car for business, you will be able to claim 45 pence per mile for the first 10,000 miles, and then 25 pence per mile for each mile thereafter. These are tax free and known as Approved Mileage Allowance Payments (AMAPS).
The 2015 Mileage Rate set by the IRS is 57.5 cents per mile, so you can see how someone who drives a lot for work can earn a pretty hefty deduction.