Display a singular category on a page, an oldie but a goodie!

Hi All,

Sorry for bring up this old one again, but i am having hair pulling out problems with this!

I am converting a Theme for a friend, and have gone through and tried changing the PHP for the main styled page using

<?php
$catID = 0;
if (is_page('18')) {
  $catID=3;
} elseif (is_page('27')) {
  $catID=4;
}

if ($catID) {
   $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
   query_posts("cat=$catID&paged=$paged");
} ?>

But its not having any of it!

Here is the code for the whole page that I have created for it:

<?php
/*
Template Name: Challenge Page
*/
?>
<?php get_header(); ?>

	<div id="featured">
        <div id="page-title" class="content">
            <h2 class="page"><?php the_title(); ?></h2>
        </div>
    </div>

    <!-- Content Starts -->
	<div id="main-content" class="page">
    <div class="content">
		<div class="col-left">
			<div id="main">

                <div class="post">
                    <h2><?php _e('Challenge Posts',woothemes); ?></h2>

                    <ul>

             <?php
				$catID = 0;
				if (is_page('18')) {
				$catID=3;
				} elseif (is_page('27')) {
				$catID=4;
}

if ($catID) {
   $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
   query_posts("cat=$catID&paged=$paged");
} ?>

            </div><!-- main ends -->
        </div><!-- .col-left ends -->

        <?php get_sidebar(); ?>

    </div>
    </div><!-- Content Ends -->

<?php get_footer(); ?>

You can view the page that I am working on here: https://www.theundentabletrust.co.uk/new/?page_id=18

All help is appreciated, I’m already going bald, i don’t need the extra help!

Thanks