I don’t remember much from yr 11 but I’m going to go with logic… You could say that:
Transport links are essential into reducing the north-south divide, as businesses from the south could open businesses up in the north, as the north tends to be a lot cheaper overall, so it may be cheaper overall for the business (which saves a lot money for them) to rent a building there, especially if you’re in London, rent there is EXPENSIVE.
This then benefits people around the north, as these new businesses open up employment opportunities for locals, as well as offering expertise (apprenticeships for young people?) which could help people achieve the right skills to get proper paying jobs.
Therefore, people get paid as a whole, and would then have the money to pay for a home, pay taxes and even afford luxuries.
As a whole, this boosts the north’s economy, therefore reducing the north-south divide.