Police are hunting for a suspect after the assault in London Bridge station around 10.15pm on July 10.
At that time, a man in his 50s was standing by the escalators near platforms two and five.(Image: BTP)
A man came up to him and punched him in the face – knocking him to the ground and breaking his glasses.
Officers have released a picture of a man they think could help with their investigation into the incident.
Anyone who recognises him is asked to text BTP on 61016, or call 0800 40 50 40, using the reference 388 of 16 July.
