Fixing join line between ceiling plasterboard?

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Joined
2 Feb 2020
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155
Location
UK
Hi,

My bathroom ceiling had a hairline crack across the full length of where plasterboard pieces are joined (matches with join in loft above). I guess this has just happened over time as they've settled / been joined badly initially. Anyway I didn't know what this was originally and so when I redecorated I raked it out a bit and filled with pollyfilla. Obviously it has just reappeared a year later.

What's the correct way to address this? Should I rake out the join line properly, use a flexible filler unlike pollyfilla, sand and paint? I see "Red Devil Filler" recommended a lot, would that work for these board join lines? Or is this a bigger problem that needs fully skimming or something?

Thanks :)
 
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