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Could be many things. Incorrect or insufficent capping of the chimney stack, failed pointing on the chimney stack, failed mortar on the crown of the chimney, or simply the fact that the chimney is a single skin of brick which was built on the basis there'd be a roaring fire underneath to drive off any moisture. You really need a man with a camera-onna-stick or drone to inspect the chimney stack.
Of course it could be condensation, but I'm assuming that it's water ingress related to the current shitty weather.
Just noticed small amount of water on the kitchen wall underneath the old chimney stack. I had new flashing on the chimney stack put in two months ago, any ideas what I should be looking out for in terms of obvious areas where water comes in on the roof? Water drops are forming alongside the full length of the chimney breast. I will call the roofer who replaced the flashing and gave a guarantee but obviously it could be the brickwork as well.
All help welcome, thank you!