Ok, so I have added the following pagination tags:

    <?php next_posts_link( 'Older posts' ); ?>
    <?php previous_posts_link( 'Newer posts' ); ?>

I can see in the address bar that the querystring is changing correctly

e.g.
localhost:8888/wordpress/?paged=3


However, the page results are staying the same *(showing the original first 10 results)*. 

What have I got wrong here?