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?