Yeah I would go into the loft you should be able to feel the joists below your feet but take your time I would look for any watermarks not just where the crack is but could be running to there from further up the roof. Then if can't see any visible water marks on the roof, walls, roof timbers taking photo of any suspect areas. If still can't see anything I would also check any plumbing pipes especially at the joints just in case a joint has a seep
feel so itchy right now. really dont wanna go back up there again today.
i think either i have to get someone in now..
.or have another go at going up again tomorrow. maybe with some wood i can clamber round. most / nearly all of the pumping up there is legacy and defunct.
its rains on most days but only on heavier rain fall it appear to come through in the bedroom. i dont know what hope i have of finding the cause.
going dig out my digi cam and see if i can get some shots of the room again. thanks again.