The water is running off the edge of the lead valley under the tiles into the soffit and back of fascia.
Needs a bigger turn up.
There's a clue in what the visiting roofer said (not very well supported) Bigger turn up and something to stop the sag from happening again. two hours max
Needs a bigger turn up.
There's a clue in what the visiting roofer said (not very well supported) Bigger turn up and something to stop the sag from happening again. two hours max