Polices want to hear from anyone who may have been outside Kingswood nightclub Chasers at the weekend and witnessed an assault that left the victim needing to go to hospital.
An arrest has been made after a man, in his 40s, was punched in the early hours of Sunday (11th December).
Police were called following the incident, which happened at about 1am outside the Regent Street club.
The victim was taken to hospital and has undergone treatment having sustained an injury to his eye and a chipped tooth.
A 36-year-old man was arrested at the scene on suspicion of assault causing actual bodily harm. He has since been released on bail.
CCTV footage is being reviewed as part of the investigation and staff at the nightclub are supporting police inquiries.
Anyone who witnessed what happened is asked to call 101 and give the call handler reference number 5222295919.