For the City, Brexit would come with a big, thick silver lining.

Don't get me wrong. It is very hard to argue that the UK leaving the European Union would be anything but damaging to the City in the long run. And in the short term, City firms would suffer from the dislocation and uncertainty caused by an exit vote. But it would not be all bad. Almost any big shift in the environment is a boon to those parts of the City that help companies, investors and governments to adapt to change. And this would be no exception.