In the event of future merging with other contemporary registries (e.g. collecting data on concurrent interventional - i.e. percutaneous transfemoral, transcarotid or trans-axillary - TAVR procedures), the co-authorship of comparative studies (e.g. between surgical and interventional treatments) will be defined by the Steering Committees of the different registries involved. However, data will not be made available for sharing until after publication of the principal results of the study. Thereafter, anonymized individual patient data will be made available for secondary research, conditional on assurance from the secondary researcher that the proposed used of the data is compliant with the MRC Policy on Data Preservation and Sharing regarding scientific quality, ethical requirements, and value for money. Anonymized data will be shared as long as the patient has agreed and consented to this. A minimum requirement with respect to scientific quality will be a publicly available pre-specified protocol describing the purpose, methods and analysis of the secondary research.