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No need for a jigsaw. A sharp disposable saw from b&q will make the cuts you need chipboard in about 6 strokes of a saw.
Don't replicate the curve which is unlikely to match your skirting anyway. Just make a neat right angled cutout.
Edit: a steel rule taped or clamped down as a guide will help keep the cut straight if you don't care about using the saw more than a couple of times, Poundland usually have them.
I've cut MDF with a jigsaw for speakers before. It scared me (not literally) but I'm trying to keep these looking neat as possible as the side of this is right in a doorway. (I could make a mess of it then just put a plant in front I suppose)