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If you are in Wessex Lane you have a small Co-Op and a McDonalds just around the corner, and a Tesco Express not much further. If you're in Glen Eyre then the small Co-Op mentioned above will be your closest.
Portswood is where most of the 2nd and 3rd years stay so the area tends to cater to students. Lots of buses run down there from halls or uni. There's a KFC, Iceland, Waitrose (if you can afford it), Boots, loads of takeaways and pubs.