The EU always sticks to its rules and processes, except until they don't suit the EU, when it just gets on and ignores them
The UK has always done pretty well this way. It might be called flexibility and imagination, adapting to situations as they arise. It is also the basis for Common Law, and our unwritten constitution.
I don't believe for one second that Frankfurt, Paris, Amsterdam and Dublin come anywhere close to London in terms of either depth or breadth of capacity, infrastructure or human resources.