I assume you can't use PHI to get a private room in a public hospital.

TIA
Pretty sure you can?? I would check it out with RWH if that is where you are thinking of and your PHI.
You can be a private patient in a public hospital for other procedures, so I would think this would extend to Maternity as well. It may be just luck of the draw or perhaps a chat with a MW about getting a single room.

My DH stayed the first night after the birth for DS1 and the last night before I went home. We had a double bed and I only paid the excess for me and that was it.
That was with Frances Perry.