It's OK - even if investment banks decide to move a "significant proportion" of their London operations to Continental Europe if the UK fails to secure any passporting rights after the Brexit vote, most the jobs going will be on the trading floor. All those lovely advisory jobs will stick around and London will still be a heavy-hitter on the world stage.
Except...except, London is really a comparative tiddler on the world stage in most areas. It punches way above its weight in the fixed income currencies and commodities (FICC) sectors and is still a relative backwater when it comes to M&A, equity capital markets and (to a lesser extent) debt capital markets. In setting out its hopes for the UK financial sector after Brexit, a wide-ranging report by the CityUK has also highlighted where London dominates in the financial sector and where it definitely doesn't. Much of this will be obvious to those in the know, but it's worth pointing out exactly where the City stands as banks review their operations.
London is by far the biggest player in ONLY FX and rates trading
The U.S. dominates pretty much everything else
It's share of the equity capital markets has shrunk dramatically
Everywhere is suffering from the lack of IPO activity currently, but the UK has suffered most of all.
But it's punching above its weight in fintech
If Berlin is really about to capture 100 fintech firms, this is a worry for the UK economy. It may 'only have 10% of the overall global market, but it employs 61,000 people. More than New York and only 12,000 less than Silicon Valley, which is obviously massive.