Isolate areas when you run the hose.
Roof lantern leaking.
Post renaissance roof lanterns were typically made from timber and glass and many structures were prone to leaking.
Start low soaking the area just above where the leak appears in the house.
In the victorian era metal framed roof lanterns became popular in building design and were used to highlight stairwells.
You may be getting a leak from these if they are missing.
A year has now passed and during the very heavy rain at the weekend a few drops came through from where the central ridge joins the supports.
Nothing serious but obviously a concern.
The hub is half a moon shape where the end roof rafters fix to.
If you don t have an attic or just can t find the source of the leak you can check several places for problems with moisture or damage.
Assuming that roof lanterns are fitted on flat roofs.
For example soak the downhill side of a chimney first then each side then the top on both sides.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Ridge cap flashing gaskets around pipes.
Remember the old saying.
These normally have a foam bung stuck to the glass as they have a sticky backing.
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Had an extension built last year with one of these on the roof.