The documentary "25 Million Pounds" from 1996 is about the collapse of Barings Bank in the 1990s. The bank collapsed thanks to the trader Nick Leeson who lost £827 million ($1.3 billion) primarily by speculating on futures contracts. If you want to learn more about Nick Leeson, you can watch the movie Rouge Trader or read the book with the same name.
Nick Leeson was released from prison in 1999 and is now a speaker lecturing about risk and corporate responsibility. You can visit his homepage here: Nick Leeson.com