The incident happened shortly after 7.30pm on the 16th of January when the victim was hit with a bottle causing a cut to his head.
Officers believe the man in the images may have information that could help their investigation.
Anyone with information is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference number 576 of 16/01/24.
Alternatively, call Crimestoppers anonymously on 0800 555 111.