Chest X-rays (CXR), antibiotics and inhaled/nebulized therapy are overused in bronchiolitis, despite evidence-based guidelines suggesting supportive management only. This study investigates the effect of the implementation of the NICE bronchiolitis guideline in a secondary paediatric unit in England. We present a quality improvement project with a completed audit cycle (winter 2014-2015 and 2015-2016) pre- and post-implementation of the NICE bronchiolitis guideline. The educational intervention included sessions for raising awareness of appropriate and inappropriate management of bronchiolitis for both clinicians and nursing staff. As a result, the number of chest radiographs reduced fivefold (from 20 to 4% of patients, absolute reduction 16%), antibiotics reduced more than threefold (from 22 to 6% of patients, absolute reduction 16%) and inhaled/nebulised treatment up to twofold (from 30 to 16%, absolute reduction 14%). Overall NICE guideline compliance rose from 28 to 63%. CONCLUSION:Implementation of the NICE bronchiolitis guideline supported by a simple educational intervention can effectively reduce the number of inappropriate chest radiographs and antibiotic prescribing in bronchiolitis, and enhance compliance with the NICE guideline. What is Known: • Bronchiolitis management in paediatric units in the UK is variable, with poor evidence for existing guidance. Best available evidence was compiled into the NICE guideline, aiming to standardize care. • Some evidence exists for the effectiveness of quality improvement approaches to improve the management of bronchiolitis. What is New: • NICE guidance can be effectively applied to a department using simple educational tools. • Effective NICE implementation reduces the rates of unnecessary chest radiograph and antibiotic administration for patients admitted with bronchiolitis in District General Hospitals.