Thanks for getting back to me Zac!
To clarify, there’s three sites in my network. There’s some content that’s global to all sites so I’ve picked one of the sites to be the ‘parent’ site where this global content is administered. In this case a post type called ‘factsheets’.
So the requirement is to pull this content from the parent site and into the two other sites. The block is used across the entire Network.
I’m totally new to React but have done plenty of ajax stuff before, I’ll look into it, but if you’ve a quick basic example to hand that would be great. I’m not part of the WP Slack group but should be able to find if withSelect can handle Multisite.