The short answer
For the first conversation, participant and vehicle details, the incident information and a claim number if available are usually enough; the exact list depends on the case.
The minimum for first contact
Prepare the date and location, contact details, basic vehicle information and whether the car is drivable. Add the claim number if the insurer has issued one.
Share documents through an agreed channel
Do not send more personal data than is needed for the first contact. Agree a secure way to share any required documents later.
What can change the document list?
The reporting route, insurer position, vehicle ownership or financing and planned repair scope can all affect what is needed next.
This is general information, not a decision on a specific claim
This is general information, not a decision on a specific claim. The right next step depends on the documents, damage and insurer’s position.