Thanks but I wanted the label wrapping in HTML not the value, also because you didn’t put your code in code tags when copying/pasting the quotes/apostrophes will be the wrong format.
I found this code which seems to work well:
<?php $field_name = "distance";
$field = get_field_object($field_name);?>
<?php if ($field['value']): ?>
<span class='post-meta-key'><?php echo $field['label']; ?>:</span> <?php echo $field['value']; ?>
<?php endif; ?>
Let me know if this is a good/bad solution.