The same thought crossed my mind the other day, but thinking through it I remembered, for print journalism: the Financial Times (which I think has a claim on 'best journalism in English'), The Guardian, and The Economist. In the U.S. a country ~4 times the size, there is only the New York Times and the Washington Post on that level (IMHO; there's also Time, Bloomberg, and others; and we're omitting Reuters, the AP, and many more in other categories).
I think the situation in the UK is similar to the US for print journalism (whatever that means these days), with a few large blocks:
* A few top-notch publications
* Far right propaganda, substantially from Murdoch / News Corp.
* A bunch of middling, substantially ineffectual stuff
(I know these are broad generalizations, with many exceptions.)