Well Scousers wouldn't think so, but it's definitely there when I recite the days of the week. It's not possible for me to say Tuesday without giving away my origins. Most of the time it's just generic northern.
I was in Cologne from 2000 - 2002. It's a lovely city, I'd move there again if I had the choice. I actually have an MA in German Translation though my everyday spoken German is a little rusty now.