The chosen ICE and TTE cines for all patients are presented in sequence. Each patient has a unique identifier ‘HOCM_number’. Where the reviewers did not agree on the best film to maximise scores each chosen cine is shown. These are the films used to create scores in phase 2. View Video 1 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-15-0002/video-1.