New CCTV footage has been published, claiming to “prove Jeremy Corbyn told the truth about Traingate.”

It purports to provide new evidence about the infamous case of Corbyn walking past empty and unreserved train seats before sitting down on the floor to make a video complaining the train was “ram packed”.

But who has released the new footage, and does it tell us anything we didn’t already know?

And didn’t Corbyn admit he’d walked past empty, unreserved seats a year ago?

Here’s everything you need to know about Traingate and the new footage.

What is Traingate?

(Image: Virgin Trains)

On August 11 2016, Jeremy Corbyn, his wife and members of his staff, including video maker Yannis Mendez, who was then employed by the Corbyn campaign, caught an 11am train from London King's Cross to Newcastle to take part in a leadership debate with rival Owen Smith .

CCTV images recorded Corbyn walking through a carriage in which there were several empty and unreserved seats and a second which had empty reserved seats.

(Image: Virgin Trains)

Corbyn then sat on the floor in a carriage vestibule where others people were sitting, where Mendez made a video of the Labour leader complaining the train was "ram packed", arguing there are not enough trains and the railways should be brought into public ownership.

While sitting on the floor, the train manager offered to upgrade Corbyn to first class, so that he could have a seat. Corbyn declined this offer.

Around 45 minutes into the journey, before its first stop in York, Corbyn was filmed taking an empty seat on his own in the first carriage he walked through.

(Image: Virgin Trains)

A week later, Mendez pitched the video as a news story to several news outlets - including the Guardian who published it -to coincide with Corbyn launching a campaign for rail nationalisation.

Corbyn later admitted that he had walked past empty, unreserved seats because he wanted to sit with his wife, and there weren't two seats together.

And Corbyn's team campaign later stated that some of the apparently empty seats on the train had "children or bags" on them. This was reported at the time.

The Guardian's reader's editor later admitted that they had been too fast to publish the video, had not clarified it fast enough and "did not think carefully enough about the status of the material being offered."

What is the new footage, and who published it?

A new outlet, Double Down News, has published new footage of the train journey on Facebook and Twitter.

Yannis Mendez, the videographer paid to shoot the original video, is listed in official documents as a director of the firm, which is not disclosed in the video or on Double Down News' Facebook page.

The "new footage" in the video refers to two new shots of CCTV, which show other people sitting on the floor on the train. This fact was never in dispute, and was widely reported at the time.

Much of the rest of the video focuses on previously published footage of Corbyn walking through the carriage with unreserved seats, where he ended up sitting.

An slow-motion section of the footage does show that some - though not all - of the seats had children in them who were only visible when they moved. While this footage is interesting and provides additional context, the fact that some of the apparently empty seats were taken by children or bags was never in dispute and was reported at the time.

So what is the truth about Traingate?

(Image: Mark Thomas/REX)

There isn't anything in the newly released video that contradicts the most recent reporting of the gaffe, which is Corbyn's admission that he had walked past empty seats because he wanted to sit next to his wife.

The real problem with Traingate was not Corbyn's decision to sit on the floor to keep his group together, or to make the video, both of which are understandable and frequently occur on trains.

Nor is it in any doubt that commuters frequently complain trains are overcrowded, and that Richard Branson's Virgin Trains had a vested interest in releasing the CCTV and opposing Corbyn's plan for franchise nationalisation.

But the decision to push the video to the press a week after the event, long after both Corbyn and the filmmaker were aware that seats were available on the train, made the original video appear misleading to many people.

The new footage does nothing to address this issue, or debunk previous reporting of the incident.