Case studies analysing real-world UK collisions where Advanced Emergency Braking Systems (AEBS) were fitted using GB STATS19 police and RAIDS national research databases. A total of 287 cases were characterised against UN Regulation No. 152 scenario requirements: car-to-car (141 cases), car-to-pedestrian (81 cases), and car-to-bicycle (28 cases). Cases were scored according to alignment with regulatory test scenarios across nine characteristics: subject vehicle speed, target speed, relative speed, ambient light, lateral overlap, trailer coupled, road layout, road surface condition, and weather conditions. Lateral overlap was the most frequently misaligned characteristic across pedestrian and cyclist scenarios. Road geometry was the most frequent misalignment in car-to-car scenarios. Speed requirements and ambient light conditions warrant consideration for regulatory review.