Practical Guidance: Medical Evidence Required to Adjourn Tribunal Hearing

What can you do if you have a client who has unexpectedly become unwell shortly before a hearing at the Administrative Appeals Tribunal?
What kind of documentation do you need to provide to the Tribunal in support of a request for an adjournment?
Or to put it alternatively, what kind of documentation should you file to preserve your client’s rights if the Tribunal refuses to grant an adjournment, decides the case against your client, and your client wants to take the case to the Federal Circuit Court to argue that the Tribunal’s refusal to grant the adjournment amounted to “jurisdictional error”?
...