Mr. Hutton has already spoken to one, and that is the interim relief. If you can intervene to stop any disciplinary processes, that is certainly one. The other one is to have avenues for redress that are easily accessible and that serve as a kind of deterrent to people who might make reprisals. Of course, there are things that already exist such as confidentiality and allowing for anonymous disclosures as well. Those would also be helpful for people who feel too endangered to identify themselves.
Those are the three big things. There are smaller things you can do as well, such as separating the whistle-blower from the reprisals.