Now using this and exactly the same issue:
// Load External jQuery
function mytheme_enqueue_scripts() {
wp_deregister_script('jquery');
wp_register_script('jquery', ("https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"), false, '1.x');
wp_enqueue_script('jquery');
}
add_action('wp_enqueue_scripts', 'mytheme_enqueue_scripts');
If I remove this then it works, but as previously mentioned I prefer to use the version on Google.