[Catfish]

The pound does not seem to be disturbed at all, but then it reacts to the outcome of negotiations, not to the word 'brexit'.

However if the blockchain really succeeds (and it has to, in the end), it will destroy a lot of banks.
Amazon is already planning to give out those credits, that banks would not. And it is well-planned, Amazon can do exact calculations what the market and smaller business will be like tomorrow, something that banks do not bother with.
With the introduction of bitcoin or other internationally accepted currencies, banks will be a thing of the past. Which includes financial centers.