Far-right activist Tommy Robinson will not be charged over an alleged assault at St Pancras railway station last month.
British Transport Police said the Crown Prosecution Service concluded no further action would be taken as “there was not a realistic prospect of conviction”.
Police said that following an investigation, the alleged victim “did not wish to provide a statement to the investigation”.
Robinson, whose real name Stephen Yaxley-Lennon, was arrested at Luton airport on 4 August, after leaving the UK for Tenerife during the early hours following the incident on 28 July.
Video footage on social media after the incident showed Mr Robinson walking back and forth near a man lying motionless on the floor, near the escalator that leads to the Thameslink line.
The footage did not show how the man came to be hurt. However, Mr Robinson appears to say in the footage: “He f***ing came at me, bruv,” before walking away down a set of stairs.
In a lengthy video on social media after the incident, Mr Robinson claimed that he acted in self-defence after a man physically confronted him.
He urged the police to share the CCTV footage of what happened.
A statement from the force on Wednesday, confirming that no charges would be laid, said: “Following a report of an assault at St Pancras station on 28 July, detectives from BTP quickly launched a full and thorough investigation, which involved a 42-year-old man being arrested on suspicion of GBH at Luton Airport on 4 August,” British Transport Police said.
“Officers worked at pace to gather evidence, including CCTV footage and witness statements, however, the victim did not wish to provide a statement to the investigation.
“We presented the prosecution file to the Crown Prosecution Service (CPS) – who are responsible for considering the evidence available and deciding whether it meets the legal threshold to charge someone with an offence.
“Following a review of the available evidence, the CPS concluded that there was not a realistic prospect of conviction and therefore there would be no criminal charges in this case.”
Mr Robinson was released from prison in May after serving seven months for contempt of court.
He was jailed in October for multiple breaches of an injunction made in 2021 that barred him from repeating false allegations against a Syrian refugee who successfully sued him for libel.
