Damp patch at top of chimney breast in bedroom

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Hi,

Anyone able to help me with this one. There's a damp patch appeared at the top of the chimney breast in the master bedroom of our late 1800s terrace, it was already a bit of a stain but since the weather got cold, it's got moist. I've ripped the paper off and It's very localised and doesnt spread to the ceiling. Up the loft, the boarded floor is dry as a bone but the chimney breast itself has seen better days, quite crumbly and a bit of condensation - no obvious signs of a leak.
Is this likely to be flashing, or just condensation.
For ref, there's a log burning stove downstairs but no open fire. Supposedly there was another fire place in the kitchen, many years ago but this is long gone.

Do we reckon this is loose flashing round the chimney or just a thin spot between the wall and the chimney breast where condensation is bleeding in?
For ref, the chimney stack has a bit of a backwards lean but when we moved in, the surveyor reckoned it was due to the rear chimney breast being removed and should just be monitored. Oh and the roof has been re-layed in the last couple of years with new underlayment and presumably new flashing round the chimney, but that was before we moved in.
IMG_20220118_144632.jpg

Cheers!
 
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If you show pics of the whole of the c/breast in the pic, and the c/breast on the ground floor below it would help?
Would you also post a pic of the leaning chimney stack?
Since moving in have you had any of your flues swept?

FWIW: run a knife blade at the abutment of the wall and the ceiling before stripping any more wallpaper.
 
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