Greggs – Portsmouth Retail Park – Opening Hours & Store Details You can find Greggs in Portsmouth Retail Park on Southampton Road, a 1.88 mile distance north from the centre of Portsmouth, in Paulsgrove (a few minutes walk from Harbour Gate Business Park). The store looks forward to serving the patrons of Port Solent, Paulsgrove, Cosham, Horsea Island, Fort Widley Married Quarters, Ports Down, Hilsea and Tipner. Hours of opening for today (Friday) are 6:30 am to 6:00 pm. This page will supply you with all the information you need on Greggs Portsmouth Retail Park, including the open hours, place of business info, telephone number and more info.