As you mention scots, I learned that 'wee' as little, is a scots word...very good video, will post the link later...What pi&&$& me off is people saying aksed instead of asked. How hard is it to pronounce it right.
I find if hard to understand the scots people. And recently in my fave Vietnamese bakery I struck an older women who I had to ask what was in the pie I was buying, it was steak and cheese and tomato. I had to ask 4 times until I got it.
It's certainly prevalent in my area, but I don't know where else it may occur.
The north-east of England has a few "groups" whereby people from certain places are known by certain names. As you will have noted (come on, pay attention at the back), there are Geordies (from Newcastle and other parts of Tyneside) and Mackems (from Sunderland). Going a little further south, Teesiders (from Middlesbrough and around that area) are known as Smoggies. This is a reference to the history of industry in that part of the world, notably the large number of chemical plants.
There are also people from Hartlepool, a town on the County Durham coast. They are known as Monkey Hangers, after a (highly dubious) story of a French ship being shipwrecked and the only survivor, the ship's monkey, being hanged as a French spy.
Incidentally, none of these terms are pejorative - people from these places commonly refer to themselves as such. I have a friend from Hartlepool and he routinely describes himself as a Monkey Hanger.
It is a relief to hear that native speakers struggle too.That's not unusual for the more rural areas - despite coming from Newcastle and having no problem with even quite dense Geordie accents, I can struggle to understand what someone from rural Northumberland is saying.