Large crack in paint - how to prep for repainting?

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Hi all, we're looking at repainting our living room but one wall has a long crack in the paint that looks like it could lift off a fair chunk of existng paint if we started pulling it off?. What's the easiest way to prep this for repainting? Pics attached
 

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looks like you have a non serious crack in the plaster background.
the crack seems to be moving. just a mm or so.
any other cracks inside or outside the house?
any previos signs of damp??
 
looks like you have a non serious crack in the plaster background.
the crack seems to be moving. just a mm or so.
any other cracks inside or outside the house?
any previos signs of damp??
Thanks for the reply . No other major cracks like that, some much smaller, fairly typical cracks in paintwork, and an issue with the internal frame of the uPVC windows conning away from the wall by about 10mm in the lounge. Had a RICS survey a month or so ago and clear of damp.
 
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If you just start scraping the paint away, you may find much more comes off.

Run a sharp utility knife down either side of the crack. Start about 5mm either side. Hopefully the paint will fall off without disrupting the paint to the side of the cut. If there is a crack in the plaster, rake it out. Then apply a coat of PVA to the plaster. Once dry fill with Toupret Fibracryl.

https://www.toupret.co.uk/business-customers/video-fibacryl®-how-fill-cracks-and-holes.html

Fibracryl isn't designed to be sanded. Smooth it off with a filler knife. Allow it to dry for a day or two, it shrinks back a bit. Then refill using a filler of your choice. I normally use Toupret Redlite, it is a dream to sand and the dust doesn't stick to everything.
 
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Top stuff, thanks for the advice
 
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its a strong possibility that the crack is a thermal movement crack in the wall structure.
very common.

you could ccut back the paint an watch an wait as the weather changes an the crack stabilises.
you could open up the plaster crack to see if thers a crack in the masonry behind?

what was the RICS doin on site - were they involved witht the window and other cracks issues?are all these issues on the same wall?
 

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