Five of Mayo’s seven siblings have MODY, which can cause extreme complications such as blindness and amputations, if not correctly diagnosed.

He said wearing the costume was “quite tricky when it’s windy… [but] all the hard work’s done so now I’m looking forward to the big event”.

Mayo added: “Diabetes Jersey have been so kind in funding the genetic testing for my family and for other families as well so it’s very important to give something back to them.”

The island’s charity helps cover the costs for people to be checked for MODY in Jersey.