We had an inch of rain last night. One inch of rainfall equals 4.7 gallons of water per square yard in old school units.
I woke in the night to the racket of a torrential downpour what sounded like a strange clicking sound. On investigation the clicks were drips coming through the ceiling in the spare room. I put a saucepan on the damp patch to catch whatever else fell and retired back to my pit.
All is well this morning and there is not even really any noticeable mark on the ceiling but something must be done. (Given how bone idle I am probably by the next lucky owner of the house.)