Comments not displaying, can’t work out why!

Hi there,

I’ve made my wordpress theme and made a custom loop for showing my content however, I cannot get comments displaying, I’m sure it must be something simple that I have overlooked. The code is as follows:

<?php if (have_posts()) : ?>
	<?php while (have_posts()) : the_post(); ?>

    <div class="content">
        	<div class="contenttopbottom">
			<?php the_time('F jS, Y') ?> by <?php the_author() ?>
            <div class="comments">
			<?php comments_popup_link('No Comments ?', '1 Comment ?', '% Comments ?'); ?></div>
            </div>

            <h1><?php the_title(); ?></h1>
            <?php the_content(''); ?>

            <div class="contenttopbottom">
				<?php if( strpos( $post->post_content , "<!--more-->" ) != false ) { ?>
				<a href="<?php the_permalink(); ?>">Read more</a>
                <?php } ?>
			</div>

    <?php comments_template(); // Get wp-comments.php template ?>
    	</div>

<?php endwhile;?>

<?php else : ?>

<?php endif; ?>