I think there's a difference between not trusting the news, as in, thinking what they're saying is lies and there's actually a great conspiracy that we can work out, and not trusting the news, as in, thinking that the information that gets conveyed via news outlets is selected and presented to push public opinion in a certain self-interested direction.
I think for the most part, people who take their news from youtube and random taxi drivers fall into the former category, whereas people who vote against the party/candidate recommended (overtly or covertly) by their local paper fall into the latter category. It's quite possible that a lot of people in the latter category would say they don't trust the news as part of a national opinion survey, but they wouldn't ever outright say to a stranger "oh, don't read the stuff printed in the City Courier, it's all lies". Particularly as the news is more and more national, but the political parties continue to attract around 50% of the vote each, I'd generally expect about 50% of the population to have at least this much distrust for at least some of the news.
I think for the most part, people who take their news from youtube and random taxi drivers fall into the former category, whereas people who vote against the party/candidate recommended (overtly or covertly) by their local paper fall into the latter category. It's quite possible that a lot of people in the latter category would say they don't trust the news as part of a national opinion survey, but they wouldn't ever outright say to a stranger "oh, don't read the stuff printed in the City Courier, it's all lies". Particularly as the news is more and more national, but the political parties continue to attract around 50% of the vote each, I'd generally expect about 50% of the population to have at least this much distrust for at least some of the news.