The Grenfell Firefighter Study is looking into the impact of firefighting on the health of firefighters during and after their career. It will be one of the largest studies in the UK into the impact of firefighting on health to date. All firefighters and officers who attended the Grenfell Tower fire will be invited to take part to have a series of tests on their heart and lungs. Staff will also be asked if they wish to provide a blood sample to screen for specific markers associated with cancers and cancer development and whether they agree for their personal data to be linked with other relevant health care records in the future until their death. This data could be used in future potential long term follow-up studies to identify ongoing health issues and cause of death port retirement. The project has the approval of the NHS Ethics Committee.