Well if she thought that Northerners are miserable wait until she sees people in London! Here in the north people will speak to you whilst you're stood at a bus stop etc, nothing special, just pass the time of day. You won't get any of that in London! I lived in London for 7 years, and even though I lived in a 'micro community' as vehelpfulguy calls them I didn't know anyone in the area, apart from the Northerners in the flat upstairs!
Don't get me wrong, the people I worked with were lovely (northerners, southerners, welsh, canadian etc etc), but I certainly wouldn't have found anyone to speak to where I lived.
I loved my time in London, I did have great friends, who I met through work, and actually met Mr Spudqueen down there (through friends), and am really pleased I lived there, but I wouldn't want to live there now - I wouldn't have wanted to bring my family up there.