Thank you, I have used the following to get the required results:
<?php if(get_field('currentShows', $post->post_parent)) { ?>
<?php while(has_sub_field('currentShows', $post->post_parent)): ?>
<li><a href="<?php the_sub_field('currentLink'); ?>"><?php the_sub_field('currentLinkText'); ?></a></li>
<?php endwhile; ?>
<?php }
else {
echo 'Coming soon';
} ?>
Thanks