Hats off to you Sir, it works!OK, on Firefox for Windows (and perhaps Linux):
Tools > Options > Advanced Tab > Network Tab > Settings.
Check Use manual proxy configuration and type in the proxy ip (80.243.182.139) and port (3128) into the boxes.
On Mac (Firefox): Preferences > Advanced (Gear) > Network subtab > "Settings…" button under connection. Paste in the IP and port while selecting "Manual proxy configuration." Then load:
http://www.bbc.co.uk/sport/0/football/20872842