Carefully loosen the husks from the corn and tie back with twine (optional). This acts as a handle while the corn is grilling and looks nice. Remove any silk that is clinging to the corn kernels.
Mix the butter, honey, chilli flakes and salt together then set aside.
Drizzle the corn with the olive oil then cook on a hot grill for 15-20 minutes, turning regularly, until the corn is starting to char and cooked through and tender.
Serve the corn hot with generous dollops of the hot honey butter.