Is there a global setting to stop testimonials getting indexed?

Using robots.txt is probably the simplest way to accomplish this (assuming you’re using pretty permalinks).

User-agent: *
Disallow: /testimonial/

More info if you need it: https://support.google.com/webmasters/answer/6062608?hl=en

If it helps, the plugin also has a filter for excluding testimonials from a front-end search on your site. Add this to your theme’s functions.php:
add_filter( 'wpmtst_exclude_from_search', '__return_true' );

• This reply was modified 8 years, 3 months ago by Chris Dillon.

Also, some SEO plugins may have settings to add noindex, nofollow meta tags for specific post types.

Thanks for your reply Chris, I think I’ll implement the robot.txt option.
Shaun