Actually we don't need any Global Bitcoin Hub Bitcoin is decentralised let it be decentralised. The best thing would be Government of all countries not only London should start accepting and adopting bitcoins as a currency. It depends on the Government of the country how they view bitcoin positively or negatively??
That's True. As such bitcoin is decentralised let it be the decentralised don't make it more confusing that whether it needs a hub or not. London can be bitcoin hub as Government has shown their interests regarding acceptance of bitcoins as a virtual currency.