The problem with this narrative is that it suggests the UK media have largely been free of partisanship up until now: “One of the reassuring aspects of life in Britain is that the main news channels present balanced news”. https://www.theguardian.com/tv-and-radio/2021/jan/24/star-hosts-gear-up-as-britain-braces-for-partisan-tv-news

In keeping with the fashionable trope of democracy & civility saved in the nick of time from the barbarian hordes, there is the recognition that we've been sailing close to the wind, but this is fortunately only an issue at the tabloid end of the spectrum.

There is no recognition here of the BBC's persistent centre-right bias, the erosion of independence through political interference in TV news (from Death on the Rock to the Hutton Inquiry), nor the way that a more rightwing press has been allowed to set broadcast agendas.

The root of the problem in the US is traced back to Reagan's abandonment of the 'Fairness Doctrine', an issue of propriety, ignoring the more fundamental shift occasioned by Bill Clinton's 1996 Telecoms Act, an issue of property (i.e. the consolidation of media ownership).

We have been poorly served by broadcasters since the 1980s because of the shift from (genuine) investigative reporting to (often confected) opinion & the recycling of press releases, & that long-predated Trump. This is the sole reference to "reporting" in the Observer article.

The fact that recent British PMs have included a former public relations flack & a journalist notorious for making stuff up should tell you that the problem is more fundamental & more widespread than TV news.