As someone who moved from the North to the South, I can tell you right now there are a gazillion more opportunities down here. I'm not saying there aren't opportunities in the North, but the diversity of 'same but different' jobs down here with much more progression is hugely better.The thing I will never understand is the cost of house buying down south vs up north. I recently bought a house up north and the same house model is literally twice the price if I had bought in Essex. The pay from the same job pays only 3k more working from the London office... absolutely insane.
£3k for the same job doesn't sound too bonkers, but the person in London won't be sitting in that job for long I would bet.