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scapa909
If the crack is not caused by loose plasterboard i.e. it doesn't move on one or both sides. My approach is to cut along the crack to open it up to a v, then use toupret TX110 to over fill it slightly, sand that back when dry and put a plasterboard scrim on top then apply a 6-10 inch band of soft plasterboard scrim filler like gyproc easy fill, let that dry and feather into the existing paintwork.
If it moves then you should use a flexible filler like Toupret Fibacryl, their lightweight scrim and overfill with Fibacryl feathering the outer edge with easy fill or TX110.
Both of these methods have worked for me despite having an entire re-development next door including cutting away overspill on the footings. It is time consuming though.