The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) the release of Princess Susannah. 'Recording or possessing a copy of this broadcast will become illegal. 'All viewers are advised to turn off their televisions immediately. 'The broadcast will commence after the following tone.' You'll have to see it through to the end. (..)2011 TvShow: Black Mirror Title: The National Anthem Season: 1 Episode 1