Hi Pat.
I think that you are right about the warmth and the humour ,though I think the reason for the difference would be more difficult to understand , but I don't think that it is deliberate .
If I could give an example of what I mean :
I spent my honeymoon in Cornwall . We stayed in Newquey. We went on an outing to Bosscastle , where I suffered a flat tyre . I had taken all the tools out of the car and forgot about them . A local garage offered to sell me a spanner to unfasten the wheel .
A very kind builder , who was doing a job close by , offered to loan me a spanner ; his accent was obviously local .
I thanked him very much for his kindness , turned and was about to attack the wheel when he asked ," Where abouts in Newcastle are you from "?
I picked up the spanner , coughed , spluttered and retorted in the deepest guttural accent that I could command , "am from Sheffild - its in Yorksher".
" Is that near Newcastle " was the response .
They just have no idea ,poor things .
Its all down to us missionaries - Do your best love .