Next / Previous Buttons not working in WordPress Theme

[Ricky55]

Hi Guys

Struggling to get this working. This code appears on my page-blog.php When the links are clicked the url changes to /page/2/ etc but the posts themselves don’t change. I have some very similar code in my single.php and its working fine. My code is below, what am I doing wrong?

<section role="main">


        <?php $page = get_page_by_title('the blog'); $content = apply_filters('the_content', $page->post_content); echo $content; ?>


        <?php $blog_posts = new WP_Query(); $blog_posts->query('showposts=5');

            if ( $blog_posts->have_posts() ) : while ( $blog_posts->have_posts() ) : $blog_posts->the_post(); ?>


        <article>

            <?php the_title(); ?>

        </article>


        <?php endwhile; ?>


        <nav id="post-nav">

            <span class="prev"><?php next_posts_link( '← View Older Posts', $blog_posts->max_num_pages ); ?></span>

            <?php previous_posts_link('<span class="next">' .( 'View more Recent Posts →' ). '</span>'); ?>

        </nav>


        <?php else:  ?>

            <p>Sorry it looks like you need to add some posts to this blog!</p>

        <?php endif; wp_reset_query(); ?>


</section>