The north/south divide seems to be amplified on MN. I've lived in both (but not London), have family in both.
I've certainly had far more prejudice from the north on having a southern accent/living in the south than I've ever had the other way round.
Both places have their benefits, both places have their drawbacks.
What I notice on here is that there is a definitely anti-southern nastiness.
Often silly things: eg a flood in the south and it gets reported on in the news, then you'll see a thread about how the news is southern centric because their flood didn't get reported on-even after people have said they saw the reports of the northern one.
People post threads with generalisations about London/Londoners which would get shouted down if they were about any other area.
And for what it's worth, I've done travel with small children round London, and never needed help and had to ask. Someone always picks up the end of the buggy, carries a suitcase, I've even been offered a seat on the busy underground when I was pregnant.
My dsis, who lives up north, used to complain people refused to help her when she asked for help when hers were small. I say I obviously look helpless 
And look at now. How many threads have there been about the dreadful Londoners leaving London yesterday? And, having seen the pictures it looks like lighter than normal Saturday traffic. Having driven over a major motorway out of London yesterday I know that was very light traffic.
But no, it must be London trying to infect the rest of the country.
It's something I wish @MNHQ would ban because it fuels prejudice and hatred.
I don't recognise the view of the south given by many people here. I also don't recognise the view of the north. Neither seems to have the root in anything but perceived prejudice.
The South/Urban is very full of people, even in the countryside there's houses everywhere. There seems to be a house in every corner of every field if you're within a couple of hours of London. There's a lot of people in a small space and most have lost touch with growing and making.
And this is a typical generalisation. I currently live just outside the M25. Within 5 minutes walk I can be in the open countryside. Yesterday I went out there (there was a beautiful double rainbow) and I saw some deer, a red kite, a nuthatch and a green woodpecker in the first 10 minutes.
My afore mentioned dsis, who does not live in a city, has to drive 10 minutes before she can get to an area like this, and even there she can hear traffic noises.
There are bits of rural North in the Urban South, and vice versa, but that's how I see the split.
Which shows the prejudice. No, there aren't bits of "rural north" in the urban south. They are bits of "rural south"; they weren't picked up and pinched from the north. They belong in the south. And there's also urban north; it's not a southern concept.