Greggs – Diss – Opening Hours & Store Details Greggs lies at 22/24 Mere Street, a 0.11 mile distance south of the centre of Diss (a few minutes walk from Diss Bus Station). This store is a beneficial addition to the areas of Roydon, Frenze, Stuston, Diss Town Centre and Palgrave. Doors are open here today (Friday) from 6:30 am until 6:00 pm, for those who would like to drop by. Here you can see the working hours, location details and direct contact number for Greggs Diss.