Greggs – Marsh Mills, Plymouth – Opening Hours & Store Details You’ll find Greggs situated in a prominent location in Marsh Mills Retail Park on Longbridge Rd, a 2.61 mile driving distance north-east of the centre of Plymouth, in Longbridge (alongside Marsh Mills Roundabout of A38 / The Parkway). The store is a great addition to the local businesses of Plympton, Higher Compton, Estover, Austin Farm, Deer Park, Leigham, Eggbuckland and Laira. 7:00 am to 7:00 pm are its operating hours for today (Friday). On this page you may find all the relevant information about Greggs Marsh Mills, Plymouth, including the store hours, store address or email contact.