You just ask, on my course we get higher marks if we secure sponsorship for our final year of some form, and a job offer.
At my company, the YinI students (post VI form) get £11.5k. They are considered able to do technical admin work, as a placement student they consider me to be of graduate level in most ways.
I don't know anybody who has been sponsored for their final year, but it obviously happens. A few of my friends have job offers now, half way through their 3rd year with 18 months remaining.