Last year, Bath University ran a summer school for 17 year olds with autism-spectrum conditions who might want to go to university (any university). It lasts 3 days and the teenagers get to stay at the university and they get introduced to university life in an ASC-friendly way. Seems they have the funding to run another one in September this year. And it's free! I'm not connected with them and my DS is still too young but I thought other people might like to know.
Introduction to University Life: summer school for students on the autism spectrum