If England really pushes for a hard Brexit it would put London's position as (financial) gateway to the EU under pressure.
Might be an opportunity to push Edinburgh as the alternative. I was pretty impressed by the infrastructure and services they already have in place last time I visited. They would probably have to expand the airport though.
This is all in the case of a hard Brexit and a Scottish independence win.
300,000 people work in the City of London alone. The population in the "local authority area" for Edinburgh is just under 500,000. That would be some investment in infrastructure if such a move were to happen!
(Plus, as much as I enjoyed studying in Edinburgh, it's a bubble compared to London.)