To clear your http://www.oxfordbrookes.net cookies please follow the appropriate section below based on the browser you are currently using.

Internet Explorer 6
Tools -> Internet Options
'Delete Cookies...' button and confirm.

Internet Explorer 7
Tools -> Internet Options
'Delete...' button under the 'Browsing history' section followed by 'Delete cookies...' and confirm.

Opera 8/9
Tools -> Preferences -> Advanced -> Cookies -> Manage Cookies
Search for 'http://www.oxfordbrookes.net' and delete all entries that appear.

FireFox 2.x
Tools -> Clear Private Data
Check Cookies and uncheck everything else before confirming.

Alternatively to clear only http://www.oxfordbrookes.net cookies;
Tools -> Options... -> Privacy -> Show Cookies...
Search for 'http://www.oxfordbrookes.net' and delete all entries that appear

Safari
Safari -> Preferences...
Click on the 'Security' option followed by 'Show Cookies'.
Either remove all cookies or browse to find cookies for http://www.oxfordbrookes.net and remove those cookies individually.