Try this guy's,
Select manual proxy configuration, and in http proxy, put 155.136.224.10 In the port box, select 80. You now appear to be browsing from the UK.
If this one goes down, simply Google for "proxy list UK" and you'll find plenty of others, make sure that you select either a distortig or an anonymous proxy, a transparent one is no use to you. Also, they sometimes show it as xxx.xx.xx.xxx:yyyy, just remember that after the colon is the port number. Using proxies is that easy.
Hope it works for you ...still half hour left in practice (y)