This pilot study aims to validate the use of vascularised donor-derived sentinel skin flaps for diagnosing rejection in pancreas transplantation. The aim of the study is to investigate the use of sentinel skin flaps in clinical practice and assess whether rejection occurs concordantly or discordantly between the skin flap and the transplanted abdominal organs. If successful, sentinel skin may allow improved immune surveillance and thereby facilitate earlier treatment of rejection with subsequent improvements in allograft survival and patient morbidity.