This trial was funded by JDRF Australian Type 1 Diabetes Clinical Research Network, the Australian Research Council and the National Health and Medical Research Council (NHMRC). In-kind support was provided by Medtronic (HCL systems, masked CGM devices and technical expertise with device issues) and Roche Diabetes Care (blood glucose meters for participants using MDI). S. A. McAuley is supported by a Juvenile Diabetes Research Foundation. J. Speight and C. M. Sims are supported by core funding to the Australian Centre for Behavioural Research in Diabetes provided by the collaboration between Diabetes Victoria and Deakin University. A. J. Jenkins was supported by a National Health and Medical Research Council Fellowship and the Baker Heart and Diabetes Institute. R. J. MacIsaac received research grants from the Rebecca L. Cooper Medical Research Foundation, St Vincent's Hospital Foundation, JDRF, Diabetes Australia Research Program and the National Health and Medical Research Council (NHMRC). A. C. Keech received a Fellowship from the National Health and Medical Research Council (NHMRC).