I'm not sure that the Grauniad has a particularly good global reputation for independent and critical journalism. It publishes the same mix of disguised opinion pieces and rather biased junk articles as the other side of the political spectrum.
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.
I mean they operate as a trust and wear their journalistic bias proudly on their sleeve; in terms of intent their altruism is self-evident.
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_...
I sort of disagree with this. I bet if you asked liberals and progressives in a country like America for a foreign newspaper they read -- if they do read one -- in most cases it is probably the Guardian. So it may be only the best of a bad bunch but it does have that reputation.
The Guardians role in modern UK society is to launder right wing talking points through a few layers of progressive sounding rhetoric so that the average person on the street can say "Well if even The Guardian agrees, maybe there is something to it."
A worthless rag of a paper.
Whilst not commenting on that, a fascinating quote from the article you are replying to is:
"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.