At Visit 1 the investigators will obtain informed consent and commence a week-long run-in period for participants to optimise insulin to carbohydrate ratio at the evening meal. During this week subjects will be requested to test BG levels at 7 points throughout the day (pre-meals, 2 hrs after meals and bed). They will be asked to eat a fat and protein free meal on one of these days. If necessary, adjustments to the insulin to carbohydrate ratio (ICR) or long-acting insulin doses will be made over the telephone by an experienced member of their clinical team. This is to decrease the likelihood of a correction bolus for a high BG level being required at the evening meal during the study week.