Beyond those already mentioned, Johnny Handle and a trio called the Northern Front (Mike Elliott, Ed Pigford and Nick whatisname) were very funny with their Geordie/Mackem adaptations of biblical stories.
The music was good, too.
Maybe you had to come from the region to appreciate it fully, though I did see Mike Elliott years later, solo in Jersey, and he went down very well. If you saw the film Billy Elliot, he played the boxing teacher