Keep the account easy to follow.
Save photographs with dates and match them to the relevant room or surface. Keep earlier product names and repair details available where known. Describe heavy furniture, fitted units and entry restrictions without moving or dismantling them. Ask what belongings need clearing and how occupants should be accommodated for the actual work, rather than undertake a major clearance before inclusion is agreed.
If another person arranges the booking, make sure the occupier’s observations reach them too. A photograph taken on a dry day may not show ordinary wetting history, so retain both accounts without claiming they establish the source.