There isn't a single news source that you can trust as such. You have to compile a lot of them, remove the unverified information and see what is left. Usually not a lot.
"Viner also oversaw the breakup of The Guardian’s celebrated investigative team, whose muck-racking journalists were told to apply for other jobs outside of investigations."
This tells you something about why you might feel that way.
That said, no British media is exempt from adherence to D Notices and tenets of their legal system like the concept of a super-injuction, whereby a court order prevents the reporting of the fact that the injunction exists at all.
https://en.wikipedia.org/wiki/Super-injunctions_in_English_l...
That the term was coined by a Guardian journalist covering the 2006 Ivory Coast toxic waste dump scandal should be context enough as to their motives and constraints.
https://en.wikipedia.org/wiki/RJW_v_Guardian_News_and_Media_...
The reformed DSMA notice system which replaced the D notice system in 2015 is somewhat more specific on what should not be reported. I think that's fit for purpose now. And it's still not legally binding. It's an agreement. Thus it does not break press freedom should the notice be found unethical or covering something up.
A worthless rag of a paper.