Regrettably, apparently owing to coverage of the Boston bombing and Margaret Thatcher's funeral arrangements, the viewing figs for the second film were considered low. As a consequence, Channel 5 has now decided to postpone the last two films. This decision can only be seen as a failure to understand the importance of the films and the story they told.
We can only hope that Channel 5 will review its decision and show the last two episodes soon.
Those interested in this important topic can see the first two films on the internet.