Plasterboard joint over 120 degree angle - how to join

Andrew_4545

New Member
Hi all, I have this on my landing. I recently moved in so I have had to remove the plasterboard due to holes and all the cracking. The previous owner slid the plasterboard in red behind the plasterboard in blue and looks like just plastered the gap to create a curved joint. I want to create a point joint so that I can fit skirting properly. What would your advice be if I was to also slide the red new plasterboard behind the blue plasterboard? Would the plasterer need anything to put in the gap to create a point joint or would they just use the plaster?
 

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