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I'd want to make sure it's not bad plumbing before resealing and hoping it stops. Best way I've found (from experience) is cutting a small hole it the ceiling where the mark is, see if you can see anything obvious, then running taps whilst observing to see if you can see any water dripping/increasing in the area above the ceiling.
hs
aggi
Judging by the mark that has appeared on my celing I may need to reseal my bath. I have the fear of doing it and it not really being watertight (but not obvious enough that I just redo it straight away).
Any top tips/guides? Cheers