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plantasia
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.