The Octagon Retail Park looks to be one of those small, unattractive edge-of-town shopping areas that were created in the 1970s. There doesn't seem to be much there.
All I can see in the area is Starplan Bedroom Specialists, Mamas & Papas, JJB Sports, Mecca Bingo, Burger King, Alliance Carpets, Staples, Apollo 2000 and British Home Stores.
That was achieved by going to Google Maps, entering the postcode ST1 5RR (which is the postcode for Mamas & Papas, on the Octagon Retail Park), zooming to Street View and then taking a look around the estate:
http://i28.tinypic.com/2vuh6x2.jpg
Try it yourself:
http://tinyurl.com/3xadfr6
Chris