No under tile felt on roof is it a problem?

[Mojo12345]

Hi everyone just went up on my loft space and found out that the roof tiles have no felt underlay or felt sarking, is this a major problem I recently brought the house it was picked up in the survey that there was no undertile felt, from what I have read a lot of houses built in 1930s don’t have the felt. Is there anyway to fit the felt in now from inside the loft or do I need a new roof and including removing old tiles? Any help or advice would be appreciated thank you

 

[Mw Roofline]

Your roof like that is probably more watertight than new builds with big pan tiles.

 

[Mojo12345]

These are the tiles from up top, I have a leak just don’t know where it’s coming from damp patches on wall

 

[datarebal]

hawkins clay plain tiles...a good reliable tile

obviously there has been some damage, two concrete plain tiles one broken on the bottom course.

The piece of underlay tucked under needs sorting properly.
As it is now it could divert rain behind the fascia , into the fascia joint and then onto the soffit and back to the house wall ..possibly

other than that , ventilate the room more