Objectives: To examine practice trends and outcomes in paediatric adenoidectomy procedures conducted in NHS England between 2008 and 2024. Design: Retrospective observational cohort study using Hospital Episode Statistics (HES). Setting: NHS trusts in England conducting paediatric adenoidectomies. Participants: Children (≤16 years) undergoing adenoidectomy. Main outcome measures: Number of adenoidectomies performed per year, including data on concurrent tonsillectomy or ventilation tube insertion. In-hospital complications and readmissions within 28 days. All-cause mortality and revision procedures were examined longitudinally. Results: 351,540 adenoidectomies were carried out within the study period. In-hospital complications occurred in 4,422 admissions (1.3%). Within 28 days of adenoidectomy 21,398 patients (6.1%) were readmitted. Of patients undergoing adenoidectomy alone, 1,099 (2.41%) were readmitted. The overall rate of haemorrhage, including adenoidectomies in the presence of concurrent procedures was 3.4%. In adenoidectomies occurring in the absence of concurrent procedures, the overall rate of haemorrhage was low (0.7%), and few (0.16%) cases required return to theatre for surgical arrest of haemorrhage from the adenoid. Over the study period, the proportion of cases requiring emergency readmission rose from 3.8% to 6.7% while the proportion of day-case procedures increased from 46.3% to 81.1%. The estimated overall revision rate across the study period is 4.52% (95% CI 4.44% - 4.61%). Conclusions: This study describes key outcomes data, providing the basis for accurate preoperative counselling in paediatric adenoidectomy. The nature of HES coding limits our ability to examine procedural details and operative indication accurately. Improved clinical coding or prospective national research is critically needed to examine technique-specific outcomes.