There are pretty quick trains to northern cities in and out of London.
I think the Guardian article is flawed in stating RG. I don’t think local people with accents are put off local RG universities at all.
It’s also easy to look at others at university and think they are all posh. They are not. Their accents are just different to the various northern ones. Durham has more state school DC than private School students. The state school students cannot possibly all be posh. But if you subscribe to the view that anyone not like you is to be avoided, as my friends DD does, you will say it’s off putting and you cannot make friends. Just as she did at school. It’s a very narrow view of the world. I also totally accept some posh dc do the same. The majority in the middle don’t.
I also am getting fed up with this relentless media and political north vs south, working class vs posh, Scotland vs England etc. It diminishes us all. Most people, if left to their own devices, make friends easily enough. If parents and schools had never pushed ordinary folk to go to Oxbridge, for example, where would we be? Why are people now crying they cannot mix? People years ago took it in their stride and really wanted it. This generation should too.