Hole in roof felt, can it be repaired from inside without removing tiles ?

[MassiveJim]

Currently in the process of boarding part of the loft out and came across this hole in the felt




It is quite obvious that a previous owner knew about it as they have placed a plastic tray underneath it to catch some of the water.
and you can see this mess beneath it where the insulation and plasterboard have all stuck together.




Is it possible to repair this from the inside without taking tiles off the roof.

 

[MassiveJim]

I don't think it is leaking now, I certainly haven't seen any evidence of damage to the bedroom ceiling below.
and the plastic tray that is underneath it is dry.

That seems very low, but I am no expert! Felt's primary purpose is to prevent wind lifting tiles; on old houses they used boards and/or cement for the same purpose. Typically roof covering should only let water in when the wind is particularly strong blowing it back under, or when things like snow happen, again allowing water to track back under the tiles. In these situations, the amount of water should be minimal and not really appear as a leak. I would still suspect in adequate flashing (if the roof is against a wall/chimney) or a crack tile if you are getting enough water in to cause a noticeable leak.

This is the gable end and it has a chimney on it, so that could be the reason.

I have the previous owners buyers report from 2018 and there were a lot of small issues with flashing, fascias, window trim, roof tiles etc mentioned in the report that the previous owners dealt with once they had moved in.