Advice on repairing large holes in plasterboard

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Hi there, I'm installing some new sockets in my living room to help relocate my tv. What would be the best way to patch the bottom of the wall up? I still have the cutout of the plasterboard can this be reused?

It's a new build, dot and dab.

Thanks in advance.
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[Alastairreid]

//www.diynot.com/forums/plastering-rendering/repairing-small-holes-in-plasterboard.362874/

 

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alastairreid, you're a star. cheers mate.