Frankly, there is nobody you can completely trust.
The tabloids are strictly comics - read them for sports, gossip and page 3. None of these am I prepared to waste time and money on.
The Mail and Express pretend to by more serious, but are both so driven by a viewpoint that I have seen stuff in there that I know, because I was involved in events (even if only as an observer), are heavily distorted and misleading.
The broadsheet newspapers (including those in tabloid format) are better. The Telegraph and Independant both have a "party line" and tailor the news to fit it. So does the Times, but it has a wider range of views from it's columnists.
TV news is too shallow; even documentaries are rarely satisfying.
Radio has similar problems, though the lack of pictures sometimes seem to make them more thoughtful.
News magazines, such as the Economist, tend to be quite strong on the editorial line, but if you watch out for this they offer some of the more detailed analysis available.
The Internet is a wonderful source for information, provided you treat it with the utmost caution.
I think what it all boils down to is get your information from as many sources as possible, bear in mind what hidden agenda your source may have, and cross check everything. If you have even the slightest doubt about a story (eg from discrepancies between sources) google it, and look at lots of different reports - after all most of the worlds news media are accessible to you now, so that report on TV about an event in Australia may look quite different if you check in an Aussie or USA paper, for instance.