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Hi there , just seen the thread and possible answers to why the water marking? looking at the age and state of the brickwork , Iwould look towards ingress through the wall at the mortar beds and perps- running down the cavity and either hitting a damaged/or indeed no cavity tray then collecting on top of the PVC frame and finally spilling down the frame and being sucked up by the plaster work on the reveals. its really common when a timber frame is removed ( quite probably its been doing this and been absorbed by the old timber frame ) as the PVC is impervious to moisture it shows as it runs down the side of the frame. You could also remove the trims on the inside and see if there is a vertical damp proof course -damaged or missing .Moisture could then bridge across to the plaster work?