CC free night valid on affiliated sites?

Apols if this has been done to death,  but could anyone tell me if the mailshot I had giving me a free night at a CC club site would be valid at either Milestone or Wagtail?  Both show up as Club Sites on the sites map, but as affiliated sites when I look on the website.

If it will be valid, I can shelve it till I phone and book tomorrow morning, stop searching for sites right now and sit back and enjoy my wine.  If not I need to carry on!!