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I did think I fixed the sealant but you can never be 100%. It looks similar downstairs too though where there isn't a window.
@tw no, I borrowed it from these for a week https://mhsgroup.org/ Far too expensive to buy
@apc good point. Not sure how to work that out though.
aggi
We’ve got very similar (but bigger) damp patches underneath the bay window in our bedroom, also apparently caused by disintegrating window sealant, which I removed and re-applied.
After a few weeks of running a dehumidifier in the room, the patch is still there, and still feels mildly moist to the touch… I hope it’s just residual water that’s trapped between brick and plaster, rather than fresh moisture still getting in…