If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures.
Repair roof tile from inside.
Inspect the roof structure near that spot for any traces of missing or broken shingles loose nails or wear and tear.
70 years is more than enough time for any roof especially if it has clay rosemary s on it and it sounds like they have blown.
Thankfully you can address your leak without having to step outside.
Unfortunately roof tiles cannot be replaced from inside.
But just like any other material they are.
Roofing tiles are one of many different types of roofing materials you can choose from to protect the roof of your home.
For anything but an occasional cracked or broken tile hire a roofer.
Expert advice on how to repair tile and masonry roofs including fixing holes and cracks and tips for replacing broken roof tiles.
Here are a few simple tips that will allow you to fix your leak from the inside.
Next push a wire through the roof leak and out through your roof.
Perhaps experts will laugh at this question but i wonder if i can replace a damaged clay red roof tile on the roof of my 1930 s house without getting someone to climb up a ladder to access a difficult to reach part of the roof when i could quite easily reach it from inside the loft.
Walk carefully on the ceiling joists in the attic or use a sheet of plywood to walk on so you will not accidentally put a hole in the ceiling panel.
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There is obviously no felt on the roof either so it looks like you are going to need a new roof.
Examine your roof from outside.
Walking around on a roof can be dangerous especially when the roof is still wet.
Sometimes the water shows up at a ceiling spot distant from the leak.
While on the roof look for the wire you poked through your ceiling from inside.
Repairing a roof leak from the inside is a temporary fix only.
Make the final repair as soon as weather permits.
I d tend to agree with agl above.
How you can fix a leaky roof from the inside if your roof is leaking you may not want to address the problem from the outside.
Holes in roofing felt are quite common here we repair a hole in some roofing felt that is underneath the tiled roof.