This documentary caused controversy when it was first screened as it documents the ongoing replacement of British people by an rapidly expanding immigrant population — an observable fact that is deemed a conspiracy theory. Originally one hour long, is has subsequently been scrubbed from the Internet. This fragment gives you some idea of the content.

Wikipedia:

Last Whites of the East End is a documentary which aired on BBC One on 24 May 2016. It documents the London Borough of Newham, a part of the East End with the lowest percentage of White British people in the country, due both to immigration and the migration of long-time residents, particularly to nearby Essex.

Before and after its broadcast, the documentary's content and claims were criticised by Newham officials, including Mayor Sir Robin Wales. The BBC maintained that it was a balanced broadcast.

Edit: I also found this version on Bitchute. It won't play on my computer but some of you may have better luck.

• Last Whites of the East End (2016) (Bitchute) [00:36:00]

I would be grateful if someone could tell me if the Bitchute link is to a full (one hour) version.