The tiles are the fairly common large concrete type and the roof has 4 x2 rafters and standard 1 battens.
Replacing roofing felt from inside loft.
The felt near the eaves near the guttering can age faster than felt further up the roof.
Replacing just the felt that has physically broken can fix any leaking without the expense of work on the whole roof which usually requires scaffolding.
Is it feasable to restore the missing felt from the inside without removing roof tiles.
Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
A section of the felt is missing from the inside of my pitched tiled roof.
This will cost around 460 510 made up of.
To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
However it can be difficult and unsafe to do it on a ladder but you might find someone who can do it.