The study will also include an objective measure of glycaemic status using a Flash Glucose Monitoring System (FGMS) called a "FreeStyle Libre" sensor in a sub-set of participants (15-20 participants). Participants can 'opt-in' to the FGMS sub-study and the device will be worn before medication is initiated and at the first follow-up visit 3-4 weeks post Ramadan. The study will also invite those participating in the sub-study to wear the device during Ramadan. The use of FGMS will provide up to 14 days of blood glucose readings taken every 15 minutes allowing us to apply glycaemic thresholds to the uploaded data and calculate the proportion of time spent in hypo, hyper or normoglycaemic states in the two treatment groups.