Remove a comment and make spotlight specific stuff clear

As this view also contains generic view stuff I was to make it clear you
can ignore the first bit when you're thinking about this
Test redirect redirects

Add in this test because a preview version of the previous commit should
have caused a test failure - it failed to redirect but this was not
caught
Merge pull request #218 from alphagov/slightly-clearer-spotlight-stuff

Remove a comment and make spotlight specific stuff clear