Awesome thanks that worked.
It was being run in a widget that allows PHP and then placed on a page.
Post object, here’s a link to the screenshot of options.

Thanks for the reply. Unfortunately that didn’t resolve it. THe post object field is set to allow a single selection.
Thanks for the reply. I have been trying to tweak the code to work but I just can’t seem to get it right. The field I am trying to use is also in an ACF options page so I think I have to change it a bit: http://www.advancedcustomfields.com/resources/get-values-from-an-options-page/
I don’t suppose you have any experience with that do you?