Russel group graduates statistically get better earning jobs coming out of uni. They often have professors that are actively authoring research and articles on the subject, though this isn't exclusive to russell groups. You should go to the university website and look up the degree you're interested in. Some won't accept BTECs. Some might expect you to have done history at A level/L3 (although politics generally doesn't expect any particular A levels/L3 subjects), and some will have a course that doesn't require this. Russell groups aren't always necessarily better they just look better on your CV. Also, I'd look at the complete university guide to see where unis rank overall and in your subject area. They'll also mention this on the website when you're looking at your specific degree. If the degree has options for placement and years abroad, they'll reference this, and the companies and countries will be shown. They'll also have the type of jobs and the different companies graduates usually go off to.