Pete on "Custom taxonomy template not working with my CT"

I have this template... taxonomy-limestone-render.php

I have this CT function that works fine in the back end...

add_action( 'init', 'register_taxonomy_limestone_render' );
    function register_taxonomy_limestone_render() {
    $labels = array(
    'name' => _x( 'Limestone Render', 'limestone-render' ),
    'singular_name' => _x( 'Limestone Render', 'limestone-render' ),
    'search_items' => _x( 'Search Limestone Render', 'limestone-render' ),
    'popular_items' => _x( 'Popular Limestone Render', 'limestone-render' ),
    'all_items' => _x( 'All Limestone Render', 'limestone-render' ),
    'parent_item' => _x( 'Parent Limestone Render', 'limestone-render' ),
    'parent_item_colon' => _x( 'Parent Limestone Render:', 'limestone-render' ),
    'edit_item' => _x( 'Edit Limestone Render', 'limestone-render' ),
    'update_item' => _x( 'Update Limestone Render', 'limestone-render' ),
    'add_new_item' => _x( 'Add New Limestone Render', 'limestone-render' ),
    'new_item_name' => _x( 'New Limestone Render', 'limestone-render' ),
    'separate_items_with_commas' => _x( 'Separate limestone render with commas', 'limestone-render' ),
    'add_or_remove_items' => _x( 'Add or remove Limestone Render', 'limestone-render' ),
    'choose_from_most_used' => _x( 'Choose from most used Limestone Render', 'limestone-render' ),
    'menu_name' => _x( 'Limestone Render', 'limestone-render' ),
    );
    $args = array(
    'labels' => $labels,
    'public' => true,
    'show_in_nav_menus' => true,
    'show_ui' => true,
    'show_tagcloud' => true,
    'show_admin_column' => false,
    'hierarchical' => false,
    'rewrite' => true,
    'query_var' => true
    );
    register_taxonomy( 'limestone-render', array('page'), $args );
    }

But I get a 404 when i try to view the CT??

Any help appreciated
Pete