Firstly I think that having this episode focus on the some of the fall-out from the global financial crisis is a good move.  It gives us another side to MI5, separate from all the bombings.  This is “insider trading on a vast scale”.  In this case, the bank in trouble is Highland Life, headed by Francis Denham. 
Derivatives trading – something I actually know something about!  Alexis Meynell, our bad guy for the week, enters a position where he gets a profit if the share price of a company falls (completely legal), and then starts rumours to ensure that the share price does fall (completely not legal).  It’s a guaranteed profit and very clever – if you can ensure that there is no link between your profit and the rumours. 
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