This is pretty dumb imo. The reason for the north south divide is because capital will develop areas in which its return is greatest. There are economic divides in all sorts of countries because of this. Germany has an east west divide, Italy has a north south divide etc. Simply getting independence from the south isnt going to fix this. Instead you will get people complaining that Manchester gets all the wealth while Newcastle lags behind.

If you want to fix England you need to abolish capitalism, attempting to solve capitalism’s problems with nationalism, especially for an oppressor nation like England, has historically always lead to fascism.