I was urging someone younger today to really appreciate the regional accents of the old folks around them, because after tv and other media spread, accents started to die and our generation will pretty much live to see the end of them. I've already outlived many I remember personally. I miss them - perhaps especially the ones that at the time I considered bumpkin.
My grandparents on one side had clear echoes of Norse, which had lasted a thousand years.
German ethnologists studied the accents of British prisoners of war in World War 1. Their recordings are a treasure trove of what existed before the homogenisation.