Revised wpq_index Shortcode Function

add_shortcode( 'wpq_index', 'mnsp_wpq_index' );
function mnsp_wpq_index() {
    // Get the ID of the current page/post, to exclude from list
    global $post;
    $current = $post->ID;

    // Get results from Shaun's WP Query Shortcode
    global $shauns_wp_query;

    $output = '<ul class="related-pages">';

    // Begin 'The Loop'
    while( $shauns_wp_query->have_posts() ) : $shauns_wp_query->the_post();

        if( $post->ID !== $current )
            $output .= '<li><a href="' . get_permalink() . '">' . get_the_title() . '</a></li>';

    endwhile;

    $output .= '</ul>';

    return $output;
}