The Spider's Web: Britain's Second Empire | Finance Documentary | History
https://www.youtube.com/watch?v=OYfnkLurLA8
And if you dont like the source, here are some alternatives.
https://www.theguardian.com/business/2012/jul/09/city-london...
https://www.theguardian.com/uk/2011/oct/31/corporation-londo...
https://www.theguardian.com/commentisfree/2011/oct/31/corpor...
https://www.theguardian.com/artanddesign/2016/feb/19/city-of...