Police are hunting this bus passenger, who attacked a ticket inspector when asked to prove he had paid his fare.
Officers from the Roads and Transport Policing Command are investigating and have released this CCTV image.
The Revenue Protection Inspector, 32, was checking fares on a 207 bus in Uxbridge Road, Hanwell at 12.20pm on January 7.
The inspector was grabbed by the Somalian suspected fare-dodger and several punches were aimed at him.
He sustained scratches to his arm and soreness to his face and did not require hospital treatment.
The suspect is described as a about 5ft 8ins aged between 35 to 40 years-old, of very slim build and wearing a denim jacket.Anyone with information is asked to contact Detective Constable Gavin Staplehurst on 020 3054 4457 or Crimestoppers anonymously on 0800 555 111, quoting ref: 169298.