I'm a chemistry student so should be shouting everyone down in favor of the sciences, but I'll be sensible for once...with media/criminology I'm fairly certain a lot of Uni's won't specify subjects just grades. I have friends who have gone on to do journalism and film with very random mixes of A Levels and I know psychology here doesn't demand psychology A Level for example.
Take something you can be sure is useful and that you're good at but stick to what you enjoy!
I did biology, chemistry, physics and randomly drama & theatre studies and dropping physics A2 in favor of drama did me no damage at all, cause I was still destined for A grades and that was what mattered! Don't worry about "vocational" if it is 40% or less practical it is still considered by top Universities as they still consider it "academic"...even Oxford (Oxford told me so on a Sutton Trust Camp so don't bother arguing!) Sometimes having the crazy vocational balance can help you stand out!