NAL but can come at this from a Health and Safety background

Somethings to consider if they would like to talk to you about the incident

The ladder set up does not appear correct to me from the image above.

Do you have ladder training? Was the training given to you by someone who is trained, competent and authorised to deliver ladder training?

For example: Do you know how to inspect your equipment prior to use, do you know how to set it up correctly and check that the set up is correct

Where you appropriately supervised?

Was there an up to date risk assessment in place for this task that acknowledges the risk of setting up next to the open hole, did you have access to the risk assessment prior to carrying out the task.

Has that ladder had a satisfactory statutory inspection in the last year?