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The condensation won't be down to the felt, it will be down to a lack of ventilation, perhaps someone has installed extra loft insulation and gone right to the eaves, new uPVC fascias/soffits can also cause issues as they seal better than old wooden ones.
The condensation could probably be sorted with a few vent tiles, lap vents or soffit vents (or a combination of all).
My brother's house that was built early 1900s has the original roof and no felt at all!! I think there are still quite a few houses around like thatm
eskay
Rich_G
Had one quote of 12k going up to 18k if they replace the tiles too...I really can't afford that I might have to get a loan or something as the felt is knackered and causing some problems with condensation and small leaks all over the shop. :(