Roof Rafter Assessment

I need a detailed structural assessment of my roof's rafters.

Key concerns include:
- Checking the structural integrity of the existing rafters.
- Evaluating the extent of the bow in the roof.
- Inspecting the condition of the tiles.

Access is very limited as it is a low-pitched roof. Roof tiles would need to be moved for inspection.

Ideal Skills and Experience:
- Experience in structural assessments
- Knowledge of roofing systems, especially tiled roofs.
- Ability to identify and report on structural issues comprehensively.

Please provide a thorough evaluation as I don't have any prior documentation.