thumb|The City of London, one of the largest financial centres in the world London's gross regional product in 2019 was £503 billion, around a quarter of UK GDP. London has five major business districts: the city, Westminster, Canary Wharf, Camden & Islington, and Lambeth & Southwark. One way to get an idea of their relative importance is to look at relative amounts of office space: Greater London had 27 million m2 of office space in 2001, and the City contains the most space, with 8 million m2 of office space. London has some of the highest real estate prices in the world.
thumb|The City of London, one of the largest financial centres in the world London's gross regional product in 2019 was £503 billion, around a quarter of UK GDP. London has five major business districts: the city Westminster, Canary Wharf, Camden & Islington, and Lambeth & Southwark. One way to get an idea of their relative, importance is to look at relative amounts of office space: Greater London had 27 million m2 of office space in 2001, and the City contains the most space, with 8 million m2 of office space. London has some of the highest real estate prices in the world.