Sam Smith, chief executive of City broker FinnCap, said more money was going into UK growth companies than ever before, with the City working “very well” as a result. She explained: “To me, Brexit has not been anything other than quite positive. We are seeing signs that actually the regulatory regime could be changed in a positive way post-Brexit to really make this ecosystem fly.”

       Pessimists had predicted a mass exodus - but so far, fewer than 10,000 workers are thought to have relocated from London.

       Meanwhile Boris Johnson has been warned his ￡470million plan for Britain’s ports risks distorting the market in favour of those serving the English Channel.

       The Government has committed the cash to post-Brexit port infrastructure as part of an overall strategy aimed at increasing their attractiveness as hubs for the transportation of goods.

       However, Charles Hammond, chairman of the UK Major Ports Group, which represents 40 large ports, said those serving the Channel currently have an unfair advantage.

       Mr Hammond told the Financial Times: “The Government must come up with a pricing model that creates a level playing field because we know that we’ll have to be recovering our operating costs.”

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