How to plaster a rounded corner (Ed.)

[wlot80]

I'm getting my downstairs walls ready for the plasterer to come in,
Some are staying to be skimmed over, others need replacing, new plasterboard in place of old larve & Plaster this one is a rounded corner which I'd like to keep, is it possible to replace it in board and keep the rounded corner, or does it need to be replaced with a standard 90° corner??

 

[RandomGrinch]

I'm not sure if you can get one in exactly the same radius, but have a search for "bullnose corner bead".