What degree would help me achieve my career goal?

I'd go with Politics and Philosophy! Politics keeps you up to date with current affairs and philosophy will teach you how to think... Great skills for any budding journalist.

Would it matter what uni I studied Phi & Pol at?

It does matter a bit. Employers are not really interested in degrees achieved from Universities ranking 30th onward, because their first class degree, sometimes, is equal to a 2:2 degree in a top Uni.
So when applying, make sure you go for the top ~25 Unis.

Is UEA?

From what I heard, it's not a bad University to study at. But you should do some research into it. You not only have to make sure the University is 'good' -- you also have to like it. You will spend three years there, after all.

All of the options there are great and perfect for it, however; I'd suggest under-going some working experience. Do some voluntary work within that field: write for the University newspaper; get some work published/edited; maybe even try and do a voluntary placement/internship at a big named Newspaper. After a few years, gather all of your work in one giant portfolio to show off when applying/interviewing.

I will Is American Studies and Hist a good choice or no? I've heard its a doss degree

All of the options there are great and perfect for it, however; I'd suggest under-going some working experience. Do some voluntary work within that field: write for the University newspaper; get some work published/edited; maybe even try and do a voluntary placement/internship at a big named Newspaper. After a few years, gather all of your work in one giant portfolio to show off when applying/interviewing.

I will Is American Studies and Hist a good choice or no? I've heard its a doss degree