Shed is really a gazebo/summerhouse type structure approx 2mx2m. The roof is felt shingles. The ply under the shingles is rotting at the edges. I think it could be restored by removing the shingles cutting back the area of damaged ply and replacing with new ply and shingles. I'm happy to take advice on other ideas if you have any.
Grant repaired and reroofed my dilapidated gazebo and restored a badly rotten garden staircase. He did a great job and brought a lot of good ideas to the project. He is hard working and focused. He's also bright, communicative, good humoured and a nice person to have around.
Highly recommended.