Hi Peter,
Thanks for the prompt reply. I did have a look at that support article before I posted this and was hoping there might be another way but it seems there isn't. I'll probably go down a different route as this could be very inefficient as a project could potentially (albeit unlikely) be related to 9 services and 9 sectors resulting in 20 queries.
I'm thinking I might just use taxonomies to achieve this. (Being a little lazy now) Is there a hook that can trigger when relationships are selected on the post ( that I could use to assign an identically named taxonomy ). I'm thinking I could then use something like BricksExtras "Related Posts" feature to quickly grab posts with matching taxonomies.
Kind regards,
Glenn