Conversely I have lived away from my home city for over 2/3rds of my whole life and I speak with a broad Scouse accent, getting proportionally broader to the disapproval rating.
Indeed the so called posher or elitist the surroundings the broader and louder I make it.
I was once told as a Warrant Officer that I would never get an LE commission unless I changed my accent. Oh how I giggled some years later when I reminded the individual of the conversation as I was retiring as a Lt Col.
But the again, my Scouse awesomeness always shines through in the end