1. Open "Network and Sharing Centre" and select "Manage Wireless networks"
2. Click "Add" to add wireless network
3. Click "Manually create a network profile"
4. Enter southbank.net details then click "Next" and "Close"
5. Double click on your new network
6. Untick "Connect to my preferred network if available"
7. Click Security tab and untick "Validate security certificate"
8. Click on the Configure button and untick "Automatically use My Windows logon name and password (and domain if any). Then click OK on all open windows and close
9. You will the be prompted to add additional information and connect to the southbank domain. Enter username & password and 'southbank' as the domain

To see these instructions with screenshots, please read the extended entry below...