Excerpt on product archive page

Q: Please could you advise on how I can get the excerpt to show in the archive pages?

A: Try adding below code to your themes functions.php:

add_action('jigoshop_after_shop_loop_item_title', 'mytheme_after_shop_loop_item_title');
function mytheme_after_shop_loop_item_title($post) {
    the_excerpt();
}