"Trump finds anti-establishment ally in Brexit's Farage"
'Can someone just explain to me how Farage and Trump can be described as not establishment?'
Because their background, or Corbyn's bacground, is irrelevant. They are all anti -establishment because they oppose the establishment on most of what it wants done and most of the establishment's core beliefs (apart from Corbyn who believes in manmade climate change).
www.yahoo.com/news/trump-finds-anti-establishment-ally-brexits-farage-043817954.html
"Farage tells Trump rally Brexit a win for anti-establishment"
www.scotsman.com/news/farage-tells-trump-rally-brexit-a-win-for-anti-establishment-1-4212591
The Establishment is the cognoscenti who determine the narrative and the policies and spread them via the media. As Corbyn said, he intends to break their "magic circle" so that the people have a say.
"The principle of democracy has to be ground up.
It is about breaking open this magical circle of Westminster, some of our great universities, Whitehall and the boardrooms who try to control thinking, control ideas and control the way policy is developed.
– Jeremy Corbyn"
www.itv.com/news/update/2016-08-21/corbyn-calls-for-westminster-magic-circle-to-be-broken/
That is why the Oxbridge teams don't want Corbyn in, because they will no longer be able to control the thinking and the narrative.
Corbyn scares the Establishment, but Trump positively terrifies them, because he doesn''t even go along with their climate change thinking.
A Trump victory will overturn everything they have worked for.