The extensive airtime given to Nigel Farage on BBC Question Time (> 30 appearances) contradicts this statement.
Just this year, it has featured the following left-wing politicians and journalists: Yasmin Alibhai-Brown, Bridget Phillipson, Ash Sarkar (a libertarian communist), Wes Streeting, Tracy Brabin, Jenny Gilruth, Ian Murray, India Willoughby, Lisa Nandy, Stephen Kinnock, Thangam Debbonaire, and Sarah Jones.
I think perhaps your issue is with right-wing people getting any airtime at all.
particularly: "there is a clear and well-evidenced bias toward panellists from right-leaning media organisations"
Citation needed. Is the BBC run by ex-Guardian people?
No: "the controversial appointment of Rishi Sunak’s ex-boss and Conservative Party donor Richard Sharp to the influential role of BBC chair. ... There are also concerns about the appointment of BBC director general Tim Davie, who stood as a councillor for the Conservative Party in 1993 and 1994 and was deputy chairman of the Hammersmith and Fulham Conservative Party in the 1990s."
https://yorkshirebylines.co.uk/politics/an-open-letter-to-th...
So, what part of your opinion is grounded in fact?
However, my point wasn't that there is a sharing of employees between the Guardian and the BBC, more that they both reflect the same bien pensant North London left wing orthodoxy - Brexit bad, immigration good, climate change an apocalypse etc etc.
That's factual. The rest "not a great article", "North London left wing orthodoxy", and "BBC is insufficiently pro-Brexit" is vague, feelings not fact-based.
> https://en.wikipedia.org/wiki/Gavyn_Davies
So this ended 19 years ago. I'm sorry, I don't see the relevance of this historical anecdote to what's currently true?
The ex-director general of the BBC Mark Thompson joined that hotbed of right wing activism, the New York Times. You also have ex-Labour minister James Purnell who had a senior role in the BBC.
Frankly if you think the BBC is anything other than the broadcast media wing of the Guardian you are severely deluded.