This is the report mentioned in https://www.theguardian.com/world/2024/mar/14/review-into-uk...

Point 2 of the summary is

The CAA has estimated that there were over 700,000 passengers and others who were affected by the failure, often for several days, and this had considerable financial and emotional consequences for them. In pursuing its work, the Panel has been motivated to draw lessons from the incident which may help the prevention of future incidents, or at least to reduce the scale of the impact on consumers, airlines and others. NERL has indicated that it has put in place actions to address a number of internal findings arising from its investigation.