@asos-petergoldsmith so you actually want to run builds just different builds based on the label. That’s indeed not possible right now.
A workaround for now might be to do a full git flow process, where a PR is merged into an integration branch (usually develop) which can have a more thorough test suite, and then if that passes it can be merged into the release branch (usually master).
Definitely not as elegant as the labels, on the other hand it’s harder to forget about running those additional test suites (should be impossible if the PR target is configured properly) vs forgetting to add the proper label.
Having both options would be even better of course 
Thanks for the details!