the_excerpt length isn't working

Hi All,

I hope someone can help!? I’ve got the following code to list out sub pages on a page:

<?php
// Set up the arguments for retrieving the pages
$args = array(
    'post_type' => 'page',
    'numberposts' => -1,
    'post_status' => null,
    'post_parent' => $post->ID, // $post->ID gets the ID of the current page
        'order' => ASC,
        'orderby' => title
    );
 $subpages = get_posts($args);
 // Just another WordPress Loop
 foreach($subpages as $post) :
    setup_postdata($post);
 ?>

I’ve then got <?php the_excerpt(); ?> to display the excerpt if one exists and this in my functions file

function new_excerpt_length($length) {
return 10;
}
add_filter('excerpt_length', 'new_excerpt_length');

// Changing excerpt more
function new_excerpt_more($more) {
return '%u2026';
}
add_filter('excerpt_more', 'new_excerpt_more');

However, the length of text doesn’t shorten. I cannot understand it! Where am I going wrong?

TIA