Mr Blue
I have lived in Newcastle all my life but my accent isn't particularly thick . Terry has the stronger dialect than Bob and Thelma , Terry's sister Audrey has an even "posher" accent. I am not sure it's deliberate but clearly to appeal to the wider British public perhaps they played it safe and softened the accents . Alun Armstrong appears in what I think is the best episode and his accent is perhaps the strongest of them all [similar to that when he played a prisoner in a Porridge episode when Godber is studying for an exam] . One episode holds a surprise Bob is ill and Terry goes to see him . In his bedroom there is a picture of a football team on the wall , they are portrayed as die hard Toon Fans but I am pretty sure the picture is of Sunderland and could be there because Bolam is a huge mackem fan