Please also try and make your talk as personal as possible so relate some of your own experiences etc. This is only an outline. If you want to present your talk in another way, that is fine. It aims to encourage applications from under-represented groups especially state school pupils. You apply to a college not the university.
Every college is different which means that a person can pick where is most suitable.
No central students' union. The only time you sample university life is at lectures or if you participate in an activity on the university level. However, it is not that difficult to meet people from other colleges. The range of subjects is traditional and relatively narrow although there is a considerable amount of variety within them. Don't apply if you want to do media studies or sport science or something else which is quite vocational.