This tweet from the Westmonster site shows how far right fake news industry works. It gives an authoritative source it knows few of its readers will have the good sense to check, and announces, “trust in BBC from some has collapsed 20 points since 2018” https://twitter.com/Michael_Heaver/status/1272791322601103360?s=20

The drivel is then retweeted and liked thousands of times. The indoctrinated say it is because the BBC is left wing and anti Brexit, as you would expect.
But what the hell does “trust in BBC from some” mean? Are these people illiterate or mendacious?

Possibly both. Go to the Reuters journalism report, Westmonster apparently quotes, and it says 64 per cent trust BBC News. It is the UK’s most trusted news source. By contrast, a tiny 16 per cent trust the Sun. https://reutersinstitute.politics.ox.ac.uk/sites/default/files/2020-06/DNR_2020_FINAL.pdf

The report does not mention a 20 per cent collapse in trust for the BBC “from some” or anyone. It says, “trust in the news has fallen over 20 percentage points since 2015.” And the least trusted news sources are the Sun, Mail, Mirror, HuffPost and Buzzfeed.

If you are not following and supporting the stop funding fake news campaign @SFFakeNews , now would be a good time to start

So where does the "trust in the BBC from some has fallen by 20 per cent come from"? The reuters summary, Westmonster does not quote in full, says "Trust in the BBC with the most partisan groups has fallen by 20 percentage points since 2018." http://www.digitalnewsreport.org/survey/2020/overview-key-findings-2020/

So the story is that the BBC remains the country's most trusted news source but the far right and far left don't belive it.
This is not news to me