London has been the financial innovation capital centre of the world for centuries. There is no way London is going to let this one slip. The large London money centre banks instead of slipping into irrelevance will go smart and begin to innovate a brand new range of products and services over the blockchain. Just as the Postal Service thought it was going to die because of email , the internet in fact made it much stronger and more profitable by allowing the introduction of a whole new range of online products and services , not even mentioning it's extra growth due to all the eBay and amazon parcels being shipped. The exact same will happen to the banks with smart management. The banks which do not follow this trend will die off.