There is much hoopla in the Remain leaning media about the potential demise of the City post Brexit. as ever, with the Remain camp, this scenario won't happen:
1 London is Anglo Saxon friendly both in terms of language and customs and practices; Paris, Berlin etc are not.
2 London has the infrastructure necessary for the 21st century financial services industry.
3 London has the cultural infrastructure (theatres, nightlife, restaurants etc) necessary to attract high calibre professionals.
4 London has the accommodation (offices and apartments) necessary to support the needs/size of financial services industry.
5 London lacks the red tape strangling enterprise on the Continent.
In short the City of London will survive!