https://www.arrivabus.co.uk/latest-news/...-newcastle

Arriva have posted a notice that all Arriva buses that serve near Barris Bridge will be diversion on evening throughout the night. I have posted a link. 

One of them shows that service 51 51A 52 306 and 308 will divert via John Dobson Street and Blackett Street and Percy Street during this time