There's an appeal for witnesses after an assault in Montague Street just before 2pm on Saturday (Oct 22).
Police were called ager a man was struck over the head with a glass bottle by another man outside Marks & Spencer.
He was taken to hospital with injuries to his head and ear.
It is believed the two men are known to each other.
When officers attended the scene, members of the public restrained a man who may have information which could help them with their enquiries.
A 35-year-old man was arrested on suspicion of GBH with intent and remains in police custody.
Anyone with video footage from the incident or people who witnessed what happened are asked to report it to police online or call 101 quoting serial number 582 of 22/10.