My opinion on this whole thing:
The train was busy.
He sat down to be filmed about how ram packed it was.
There were some seats. It can be debated how many (as many could have been occupied by children and/or midgets) but ultimately he found seats, perhaps with help of the train manager and some people moving, possibly upgraded to first class.
The train allowed for people to walk through the train and visit the cafe bar, including anyone that was upgraded to first class. It was suggested Jeremy was offered an upgrade, but presumably refused as he couldn't be seen to occupy such an area!
The person who did the original film was very careful to report the story in a certain way.
One year on, the same person it seems has tried to vindicate himself through a media organisation taking on the evil MSM, but with likely affiliations to the Labour party or Momentum.
The video doesn't really help prove the train was ram packed, just busy (as per the first sentence).
Another train may have been busier and could have been used instead, but this was probably a 'great idea' thought up on the spot.
Jeremy was likely talked into this great idea and now wishes he hadn't done it, and is probably not best pleased that this video exists to bring up the whole story again.
He wanted to make a point, and could have done so without any of this fuss by just doing some basic planning and getting a genuinely crush loaded train where he could barely get on and had to stand for 2 or 3 hours, unable to even go to the toilet.
Even if he had, that still wouldn't have been representative of the railway as a whole so people could still have pointed this out.
Those who vote Labour and like Jeremy Corbyn will stand by Jeremy, and blame the Tories for being behind this - and attacking evil capitalist Richard Branson.
Those who vote Labour and don't like Corbyn will probably stay quiet.
Those who don't vote Labour will likely make the most of this and argue forever more, making this whole saga continue for years.
We'll one day come to realise that all these new media organisations trying to kill off the fake news mainstream media are full of agendas themselves and should be treated with extreme caution even if it fits your own beliefs.
(Did I miss anything?)