it creates trouble everwhere else.
Yeah, it would do. But these problems are unavoidable unless you have lots of seats, because of what County Durham is like. I'll have a closer look at things fairly soon, I think.
For reference, the following 2003-2008 wards cover were all in (more or less) the same area as the pre-1974 Durham Municipal Borough: Neville's Cross, Elvet, Pelaw & Gilesgate, St Nicholas, Crossgate & Framwelgate, Newton Hall North and Newton Hall South.
I can do the same for any other town in the North East, if it helps.