Identify how many palings are affected and where they have detached. Refixing may be possible when the boards and rails remain sound. A moving fence section needs a wider assessment rather than simply adding more screws through the visible boards.
A repair may depend on reaching the fixing side of the fence. Explain available access and any neighbour or property-manager permission required. Do not assume entry to another property is included merely because the damaged board faces your garden.
Post movement or failure belongs to a different assessment and may exceed a small repair. Describe leaning or movement in the whole section. Paling work is bounded to local boards on suitable support, not a way to conceal an unstable fence.
The agreed service covers suitable local paling reattachment/replacement and compatible fixing review. Exclusions: Post repair (existing intent), major panel/fence replacement, retaining structures, boundary disputes, pool barriers, unstable supports.