However this isnt the only problem.
How to repair roof felt in loft.
The felt is a secondary water barrier in case a tile is broken ect.
The lead is finally fixed in place with copper nails hidden under the overlaps.
Nothing lasts and the loft is still bone dry though well ventilated.
This will cost around 460 510 made up of.
Alternately get more roofing felt and a tube of roofing caulk and glue felt patches over the rips with the caulk.
You can use flashing tape to fix the holes in the underfelt.
According to the building expert in the telegraph the lining is only to keep the house interior dry until the tilers have.
You can fix tears in your roofing felt by putting a patch of new felt underneath.
Where wind driven rain is working under the roof and causing leaks then the felt will need to be replaced.
A thin layer of fibrous material is inserted between the lead and the valley board such as breathable membrane roofing felt but not mineral felt.
So check the roof for any broken or loose tiles.