OK. I have got the values individually like this:
$page1 = get_page_by_title ('About');
$page2 = get_page_by_title ('Services');
$page2 = get_page_by_title ('Privacy');
and they all work. For example:
wp_list_pages('exclude='.$page1->ID);
wp_list_pages('exclude='.$page2->ID);
wp_list_pages('exclude='.$page3->ID);
But I cannot seem to combine them so that a single instance of wp_list_pages excludes all of them.
I know this is no where near right, but the result I am seeking is:
wp_list_pages('exclude='.$page1->ID, .$page2->ID, .$page3->ID);
Thanks for your help so far. Sorry not to have figured this.