I have victorian house and over the years we have had the doors stripped back to pine and left them untreated without any problems etc Last year we had the door to the small toilet on upper landing stripped, again we left it untreated. I guess having the window open on occassions has caused problems and all of a sudden it wont close. On closer inspection the door has gone like a banana! Looking at the door forcibly closed from the inside it is as follows. On the hinge side at top and bottom it touches the frame, in the middle of the frame it is 10mm away. So the edge of the door on the hinge side is a perfect banana curve. On the opposite side it is 10mm away top and bottom and in the middle (where the lock is) it wont shut. Is there a way to get the door back in shape as I don't think just shaving off the edge near the lock is the answer?