The reason for this, presumably, has to do with the unique governance of the City of London, a system inherited from the feudal era and adapted seamlessly to the neoliberal age. Being the corporate centre of Britain's finance industry, the City's office bearers are elected by the corporations who have offices in the square mile; each corporation's share of votes is proportional to its global employee count. As such, it is the ideal post-democratic governing model for the New World Order, reflecting the realities of neoliberalism far more efficiently than the alternative of “democracy plus lobbyists plus corporations-are-people plus unlimited campaign expenditure” (as seen in the US) does.
The City of London taking responsibility for enforcing corporate monopolies on cultural exchange (“intellectual property”) across the land could be merely an early step in its ascension to being a branch of Britain's government, and one which wields real power. Perhaps in a few decades' time, we will see the parliaments of Westminster and Holyrood (by then, packed with a motley crew of wild-eyed socialists, foamy-mouthed right-wing populists and Pirate Party types) reduced to student union-style talking shops with no real power, with executive decisions devolved to the City of London's eminently level-headed corporate appointees?